A cooling water supply and drainage system for a hydro-turbine generator set capable of saving water resources

Abstract

A cooling water supply and drainage system for a hydro-turbine generator set that can save water resources includes a plurality of supply and drainage mechanisms corresponding to the hydro-turbine generator set one by one, the supply and drainage mechanisms including a water intake valve group, a diverter valve group and a drainage valve group; the water intake valve group includes a volute water intake valve, a clean water intake valve and a main water supply valve, the main water supply valve is connected to the volute water intake valve and the clean water intake valve; the diverter valve group includes a plurality of diverter water supply valves, the plurality of diverter water supply valves are connected in parallel with the main water supply valve, the main water supply valve and the plurality of diverter water supply valves are connected in series with the cooling load one by one; the drainage valve group includes a main drainage valve, a three-way valve for supply and drainage and a plurality of diverter drainage valves, the main water supply valve, the main drainage valve and the three-way valve for supply and drainage are connected in series, the plurality of diverter drainage valves are connected in series with the cooling load one by one; in two adjacent supply and drainage mechanisms, the three-way valve for supply and drainage of the previous supply and drainage mechanism is connected to the main water supply valve of the next supply and drainage mechanism. The present invention can flexibly select the source and flow mode of cooling water, thereby saving water resources.

Description

Technical Field

[0001] The invention relates to a field, in particular to a cooling water supply and drainage system for a water turbine generator set capable of saving water resources. Background Art

[0002] The hydro-turbine generator set is the main equipment to ensure the economic benefits of the hydropower station. With the continuous development of the hydropower industry, the installed capacity of the power station and the unit capacity of the unit are constantly increasing, and the demand for cooling water is also increasing. The traditional cooling water supply system will cause a great waste of water resources and affect the green and efficient development of the hydropower station. Therefore, an economical unit cooling water supply and drainage system is of great significance to hydropower stations, especially large hydropower stations.

[0003] At present, the cooling of hydropower units mainly adopts volute gravity pressure reduction water supply, and the various parts of the unit are cooled in parallel. The cooling water is directly discharged into the tail water, which consumes a lot of water. At the same time, most hydropower stations, especially those in the north, have a large temperature difference in the four seasons. In the spring, autumn and winter seasons, the cooling water can be fully reused after cooling the unit.

[0004] As we all know, many rivers in my country have high sediment content, and most hydropower plant units use volute water as the main water source for cooling water. During the flood season, high-sediment water flows through the cooling water pipeline, which is very likely to cause blockage of the cooling pipeline, affecting the safe and stable operation of the unit. The safe operation of the unit must use groundwater or other clean water sources. The cooling water consumption of hydropower generator units is very large. If groundwater or other water is used as the cooling water source, continuous large-scale water pumping for 24 hours a day will not only consume huge energy, but also cause the groundwater level in the nearby area to drop if a large amount of groundwater is pumped. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a cooling water supply and drainage system for a hydro-turbine generator set that can save water resources, and can flexibly select the cooling water source and cooling water flow mode, thereby saving water resources.

[0006] In order to achieve the above-mentioned purpose, the specific scheme adopted by the present invention is: a cooling water supply and drainage system for a hydro-turbine generator set that can save water resources, the hydro-turbine generator set includes multiple cooling loads, the system includes a plurality of supply and drainage mechanisms corresponding to the hydro-turbine generator set, the supply and drainage mechanisms include a water intake valve group, a diverter valve group and a drain valve group; the water intake valve group includes a volute water intake valve, a clean water intake valve and a main water supply valve, the main water supply valve is connected to the volute water intake valve and the clean water intake valve; the diverter valve group includes a plurality of diverters A water supply valve, a plurality of diversion water supply valves are connected in parallel and connected to the main water supply valve, and the main water supply valve and the plurality of diversion water supply valves are connected in series with the cooling load one by one; the drain valve group includes a main drain valve, a three-way valve for water supply and drainage and a plurality of diversion drain valves, the main water supply valve, the main drain valve and the three-way valve for water supply and drainage are connected in series, and the plurality of diversion drain valves are connected in series with the cooling load one by one; in two adjacent supply and drainage mechanisms, the three-way valve for water supply and drainage of the previous supply and drainage mechanism is connected to the main water supply valve of the next supply and drainage mechanism.

[0007] As a further optimization of the cooling water supply and drainage system of the above-mentioned water-saving hydro-generator set: the supply and drainage mechanism also includes a regulating valve group, the regulating valve group includes a parallel water supply valve, a series drain valve and a flow regulating valve, the parallel water supply valve is connected in parallel with one of the diverter water supply valves and then connected to the main water supply valve, the series drain valve is connected to the parallel water supply valve, the remaining diverter water supply valves are connected in parallel between the parallel water supply valves and the series drain valves, the flow regulating valve is connected to the main drain valve, all the diverter drain valves are connected in parallel between the flow regulating valve and the main drain valve, and the series drain valve and the flow regulating valve are both connected to the water supply and drainage three-way valve.

[0008] As a further optimization of the cooling water supply and drainage system of the above-mentioned water-turbine generator set that can save water resources: the cooling load includes an upper guide bearing cooler, a thrust bearing cooler, a lower guide bearing cooler and a water-guide bearing cooler, the diverter water supply valve includes an upper guide water supply valve connected in series with the upper guide bearing cooler, a thrust water supply valve connected in series with the thrust bearing cooler, a lower guide water supply valve connected in series with the lower guide bearing cooler, and a water-guide water supply valve connected in series with the water-guide bearing cooler, the diverter drain valve includes an upper guide drain valve connected in series with the upper guide bearing cooler, a thrust drain valve connected in series with the thrust bearing cooler, a lower guide drain valve connected in series with the lower guide bearing cooler, and a water-guide drain valve connected in series with the water-guide bearing cooler.

[0009] As a further optimization of the cooling water supply and drainage system of the water turbine generator set capable of saving water resources, the cooling load includes an air cooler, and the main water supply valve, the air cooler and the main drainage valve are connected in series.

[0010] As a further optimization of the cooling water supply and drainage system of the above-mentioned water-turbine generator set that can save water resources: flow meters are connected in series between the upper guide water supply valve and the upper guide bearing cooler, between the thrust water supply valve and the thrust bearing cooler, between the lower guide water supply valve and the lower guide bearing cooler, between the water guide water supply valve and the water guide bearing cooler, and between the main water supply valve and the air cooler, and thermometers are connected in series between the upper guide bearing cooler and the upper guide drain valve, between the thrust bearing cooler and the thrust drain valve, between the lower guide bearing cooler and the lower guide drain valve, between the water guide bearing cooler and the water guide drain valve, and between the air cooler and the main drain valve.

[0011] As a further optimization of the cooling water supply and drainage system of the water turbine generator set capable of saving water resources, a volute water intake pressure reducing valve is connected in series between the volute water intake valve and the main water supply valve.

[0012] Beneficial effects: The present invention can use volute water or clean water as cooling water. When the volute cement sand content is high during the flood season, clean water is used as cooling water to avoid pipeline blockage by sediment. When the volute cement sand content is low during the non-flood season, volute water is used as cooling water, thereby saving clean water resources and avoiding the lowering of groundwater levels in nearby areas due to excessive use of clean water resources. The two water sources can complement each other, thereby improving the stability and reliability of the system. In addition, multiple supply and drainage mechanisms can supply water in series, thereby realizing the reuse of cooling water and further saving water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0014] Description of the drawings: 1-volute water intake valve, 2-volute water intake pressure reducing valve, 3-clean water intake valve, 4-main water supply valve, 5-parallel water supply valve, 6-water guide water supply valve, 7-water guide drain valve, 8-lower guide water supply valve, 9-lower guide drain valve, 10-thrust water supply valve, 11-thrust drain valve, 12-upper guide water supply valve, 13-upper guide drain valve, 14-series drain valve, 15-flow regulating valve, 16-main drain valve, 17-water supply and drainage three-way valve. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] See also Figure 1A cooling water supply and drainage system for a hydro-turbine generator set that can save water resources. The hydro-turbine generator set includes multiple cooling loads. The system includes several supply and drainage mechanisms corresponding to the hydro-turbine generator sets one by one. The supply and drainage mechanisms include a water intake valve group, a diversion valve group and a drainage valve group.

[0017] The water intake valve group comprises a volute water intake valve 1 , a clean water intake valve 3 and a main water supply valve 4 , and the main water supply valve 4 is connected to both the volute water intake valve 1 and the clean water intake valve 3 .

[0018] The diverter valve group includes a plurality of diverter water supply valves, which are connected in parallel with the main water supply valve 4, and the main water supply valve 4 and the plurality of diverter water supply valves are connected in series with the cooling load in a one-to-one correspondence.

[0019] The drain valve group includes a main drain valve 16, a water supply and drainage three-way valve 17 and multiple diversion drain valves. The main water supply valve 4, the main drain valve 16 and the water supply and drainage three-way valve 17 are connected in series. Multiple diversion drain valves are connected in series with the cooling load one by one. After being connected in parallel, multiple diversion drain valves are connected to the main drain valve 16.

[0020] In two adjacent supply and drainage mechanisms, the water supply and drainage three-way valve 17 of the preceding supply and drainage mechanism is connected to the main water supply valve 4 of the succeeding supply and drainage mechanism.

[0021] When the present invention is in use, the volute water intake valve 1 is connected to the volute of the hydro-generator set, and the clean water intake valve 3 is connected to the clean water source well. During the flood season and when the unit has a high sand content, the volute water intake valve 1 of each supply and drainage mechanism is closed and the clean water intake valve 3 is opened. The clean water in the clean water source well passes through the clean water intake valve 3 and the main water supply valve 4 in turn as cooling water, and then flows through the diversion water supply valve to cool the cooling load. Thereafter, the cooling water flows through the diversion drainage valve and the main drainage valve 16 in turn to the supply and drainage three-way valve 17. If the temperature of the cooling water is low at this time and can still cool the cooling load, the supply and drainage three-way valve 17 is adjusted to connect the main drainage valve 16 of the previous supply and drainage mechanism and the main water supply valve 4 of the next supply and drainage mechanism, so that the cooling water enters the next supply and drainage mechanism to cool the cooling load of the next hydro-turbine generator set. If the temperature of the cooling water is high at this time and cannot continue to cool the cooling load, the supply and drainage three-way valve 17 is adjusted to connect the main drainage valve 16 and the tail water pipe, so that the cooling water is discharged through the tail water pipe. In the non-flood season and when the sediment content of the unit is low, close the clean water intake valve 3 of each supply and drainage mechanism and open the volute water intake valve 1. The volute water flows into the supply and drainage three-way valve 17 through the diverter drain valve and the main drain valve 16 as cooling water. If the temperature of the cooling water is low at this time and can still cool the cooling load, the supply and drainage three-way valve 17 is adjusted to connect the main drain valve 16 of the previous supply and drainage mechanism and the main water supply valve 4 of the next supply and drainage mechanism, so that the cooling water enters the next supply and drainage mechanism to cool the cooling load of the next hydro-turbine generator set. If the temperature of the cooling water is high at this time and cannot continue to cool the cooling load, the supply and drainage three-way valve 17 is adjusted to connect the main drain valve 16 and the tail water pipe, so that the cooling water is discharged through the tail water pipe.

[0022] The present invention can use volute water or clean water as cooling water. When the volute water sediment content is high during the flood season, clean water is used as cooling water to avoid pipeline clogging by sediment. When the volute water sediment content is low during the non-flood season, volute water is used as cooling water, thereby saving clean water resources and avoiding the lowering of groundwater levels in nearby areas due to excessive use of clean water resources. The two water sources can complement each other, thereby improving the stability and reliability of the system. In addition, multiple supply and drainage mechanisms can supply water in series, thereby realizing the reuse of cooling water and further saving water resources.

[0023] The supply and drainage mechanism also includes a regulating valve group, which includes a parallel water supply valve 5, a series drainage valve 14 and a flow regulating valve 15. The parallel water supply valve 5 is connected in parallel with one of the diverter water supply valves and then communicated with the main water supply valve 4. The series drainage valve 14 is connected to the parallel water supply valve 5. The remaining diverter water supply valves are connected in parallel between the parallel water supply valve 5 and the series drainage valve 14. The flow regulating valve 15 is connected to the main drainage valve 16. All diverter drainage valves are connected in parallel between the flow regulating valve 15 and the main drainage valve 16. The series drainage valve 14 and the flow regulating valve 15 are both connected to the three-way valve for water supply and drainage 17. Through the regulating valve group, you can choose to supply water in series or in parallel. When the series water supply is selected, the parallel water supply valve 5 and the main drain valve 16 are closed, and the flow regulating valve 15 is opened, the cooling water flows through a diverter water supply valve connected in parallel with the parallel water supply valve 5, and then cools the cooling load connected to the diverter water supply valve, and then flows to the remaining diverter water supply valves through the remaining diverter drain valves, and the remaining cooling loads are cooled in the process. The cooling water flow rate of the cooling load corresponding to the diverter water supply valve connected in parallel with the parallel water supply valve 5 is equal to the cooling water flow rate of all the remaining cooling loads, and finally the cooling water flows to the water supply and drainage three-way valve 17 through the flow regulating valve 15. By adjusting the flow regulating valve 15, the flow rate of the series water supply can be adjusted. When the parallel water supply mode is selected, the parallel water supply valve 5 and the main drain valve 16 are opened, and the series water supply valve 14 and the flow regulating valve 15 are closed. The cooling water flows through the parallel water supply valve 5 and a diverter water supply valve connected thereto at the same time. The cooling water flowing through the parallel water supply valve 5 flows through the remaining diverter water supply valves respectively to cool the remaining cooling loads, thereby achieving simultaneous cooling of all cooling loads. After cooling, the cooling water flows to the water supply and drainage three-way valve 17 through the main drain valve 16.

[0024] In this embodiment, the cooling load includes an upper guide bearing cooler, a thrust bearing cooler, a lower guide bearing cooler and a water guide bearing cooler, the diverter water supply valve includes an upper guide water supply valve 12 connected in series with the upper guide bearing cooler, a thrust water supply valve 10 connected in series with the thrust bearing cooler, a lower guide water supply valve 8 connected in series with the lower guide bearing cooler and a water guide water supply valve 6 connected in series with the water guide bearing cooler, and the diverter drain valve includes an upper guide drain valve 13 connected in series with the upper guide bearing cooler, a thrust drain valve 11 connected in series with the thrust bearing cooler, a lower guide drain valve 9 connected in series with the lower guide bearing cooler and a water guide drain valve 7 connected in series with the water guide bearing cooler. The cooling load includes an air cooler, a main water supply valve 4, an air cooler and a main drain valve 16 connected in series. A flow meter is connected in series between the upper guide water supply valve 12 and the upper guide bearing cooler, between the thrust water supply valve 10 and the thrust bearing cooler, between the lower guide water supply valve 8 and the lower guide bearing cooler, between the water guide water supply valve 6 and the water guide bearing cooler, and between the main water supply valve 4 and the air cooler. A thermometer is connected in series between the upper guide bearing cooler and the upper guide drain valve 13, between the thrust bearing cooler and the thrust drain valve 11, between the lower guide bearing cooler and the lower guide drain valve 9, between the water guide bearing cooler and the water guide drain valve 7, and between the air cooler and the main drain valve 16. Because the air cooler has a large demand for cooling water, in order to maintain a balanced amount of cooling water during series water supply, the air cooler's series diversion water supply valve is connected in parallel with the parallel water supply valve 5.

[0025] In order to prevent excessive volute water flow from causing strong impact on the cooling load and causing damage to the cooling load, a volute water intake pressure reducing valve 2 is connected in series between the volute water intake valve 1 and the main water supply valve 4. When volute water is selected as cooling water, the volute water intake pressure reducing valve 2 is opened to adjust the water pressure of the volute water and protect the cooling load.

[0026] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cooling water supply and drainage system for a hydro-generator set capable of saving water resources, wherein the hydro-generator set includes a plurality of cooling loads, and is characterized in that: The system includes a plurality of supply and discharge mechanisms corresponding to the hydro-generator sets one by one, the supply and discharge mechanisms including a water intake valve group, a diversion valve group and a drainage valve group; The water intake valve assembly comprises a volute water intake valve (1), a clean water intake valve (3) and a main water supply valve (4), wherein the main water supply valve (4) is connected to both the volute water intake valve (1) and the clean water intake valve (3); The diverter valve group comprises a plurality of diverter water supply valves, the plurality of diverter water supply valves are connected in parallel and communicated with the main water supply valve (4), and the main water supply valve (4) and the plurality of diverter water supply valves are connected in series with the cooling load in a one-to-one correspondence; The drainage valve group comprises a main drainage valve (16), a water supply and drainage three-way valve (17) and a plurality of diversion drainage valves, the main water supply valve (4), the main drainage valve (16) and the water supply and drainage three-way valve (17) are connected in series, and the plurality of diversion drainage valves are connected in series with the cooling load in a one-to-one correspondence; In two adjacent supply and drainage mechanisms, the water supply and drainage three-way valve (17) of the preceding supply and drainage mechanism is connected to the main water supply valve (4) of the succeeding supply and drainage mechanism; The supply and drainage mechanism further comprises a regulating valve group, which comprises a parallel water supply valve (5), a series drainage valve (14) and a flow regulating valve (15); the parallel water supply valve (5) is connected in parallel with one of the diverter water supply valves and then connected to the main water supply valve (4); the series drainage valve (14) is connected to the parallel water supply valve (5); the remaining diverter water supply valves are connected in parallel between the parallel water supply valve (5) and the series drainage valve (14); the flow regulating valve (15) is connected to the main drainage valve (16); all the diverter drainage valves are connected in parallel between the flow regulating valve (15) and the main drainage valve (16); the series drainage valve (14) and the flow regulating valve (15) are both connected to the water supply and drainage three-way valve (17); A volute water intake pressure reducing valve (2) is connected in series between the volute water intake valve (1) and the main water supply valve (4); The cooling load comprises an upper guide bearing cooler, a thrust bearing cooler, a lower guide bearing cooler and a water guide bearing cooler; the diverter water supply valve comprises an upper guide water supply valve (12) connected in series with the upper guide bearing cooler, a thrust water supply valve (10) connected in series with the thrust bearing cooler, a lower guide water supply valve (8) connected in series with the lower guide bearing cooler and a water guide water supply valve (6) connected in series with the water guide bearing cooler; the diverter drain valve comprises an upper guide drain valve (13) connected in series with the upper guide bearing cooler, a thrust drain valve (11) connected in series with the thrust bearing cooler, a lower guide drain valve (9) connected in series with the lower guide bearing cooler and a water guide drain valve (7) connected in series with the water guide bearing cooler; The cooling load comprises an air cooler, and the main water supply valve (4), the air cooler and the main drain valve (16) are connected in series.

2. A water-saving water supply and drainage system for a turbine generator set according to claim 1, characterized in that: A flow meter is connected in series between the upper guide water supply valve (12) and the upper guide bearing cooler, between the thrust water supply valve (10) and the thrust bearing cooler, between the lower guide water supply valve (8) and the lower guide bearing cooler, between the water guide water supply valve (6) and the water guide bearing cooler, and between the main water supply valve (4) and the air cooler. A thermometer is connected in series between the upper guide bearing cooler and the upper guide drain valve (13), between the thrust bearing cooler and the thrust drain valve (11), between the lower guide bearing cooler and the lower guide drain valve (9), between the water guide bearing cooler and the water guide drain valve (7), and between the air cooler and the main drain valve (16).

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