Anti-condensation device for public water supply

Abstract

The utility model provides a public water supply anti-condensation device which is simple in structure, easy in method implementation, convenient to operate and high in applicability, and comprises a draft tube, a public water supply and water taking header pipe, a cooling unit and a technical water supply and water drainage header pipe, and the public water supply and water taking header pipe takes water from the draft tube to obtain hot water passing through cooling unit users. The system further comprises a public water supply anti-condensation system and an in-plant air temperature sensor, and the public water supply anti-condensation system takes water from the technical water supply and drainage main pipe; the anti-condensation effect is achieved by monitoring the temperature of the pipeline in the anti-condensation system and regulating and controlling the temperature difference between the temperature of the pipeline and the temperature of air in a plant.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power production, in particular to a public water supply anti-condensation device suitable for a pumped storage power station. Background Art

[0002] According to the characteristics of water supply and water intake of pumped storage power stations, water is generally taken from the tailwater pipe, where the water temperature is relatively low. After being pressurized by the technical water supply pump, it is transported to each user end of the unit. After passing through each user, the water temperature rises, and then passes through Figure 1 The cooling unit shown includes an upper guide bearing cooler, a generator air cooler, a thrust bearing cooler, a water guide bearing cooler, a lower guide bearing cooler, a main shaft seal water supply, a leak-proof ring water supply and a main transformer cooler, and finally the water is discharged to the downstream through a drainage main pipe to form a circulation.

[0003] In autumn, winter and early spring, the air temperature is significantly higher than the water temperature, and condensation will form on the water pipes due to condensation of hot air. This will not only cause humidity in the plant, a large number of water droplets will form on the ground, but will also have an adverse effect on the paint on the outer surface of the pipeline. Therefore, during the operation of the technical water supply system of the pumped storage power station, anti-condensation measures need to be taken for the pipeline.

[0004] After field practice verification, it was found that if the temperature difference between the water temperature and the air temperature is within 8°C, condensation will not occur. The method of covering with insulation layer is widely used in anti-condensation measures for hydraulic pipelines, but the working pressure of the water supply pipelines in hydropower plants is extremely high. Covering with insulation layer will bring great inconvenience to subsequent inspection and maintenance, and may even bring safety hazards. Domestic hydropower construction and management units have explicitly required that the technical water supply pipelines of hydropower stations are prohibited from being covered with insulation layer. In addition, methods such as increasing the number and power of dehumidification equipment and adding dehumidification systems are not only economical, but also have a great impact on the original equipment operating environment and power demand in the plant, so it is difficult to implement.

[0005] In summary, there is currently no device and method for preventing condensation in water supply pipelines that is simple in structure, easy to operate, and applicable to the entire hydropower plant. Utility Model Content

[0006] The utility model aims to provide a public water supply anti-condensation device which has a simple structure, is easy to implement, is convenient to operate and has strong applicability.

[0007] In order to achieve the above object, the utility model is implemented through the following technical solutions:

[0008] The public water supply anti-condensation device includes a tailwater pipe, a public water supply main pipe, a cooling unit, and a technical water supply and drainage main pipe. The public water supply main pipe takes water from the tailwater pipe to obtain hot water after passing through the cooling unit user, and then flows into the tailwater pipe through the technical water supply and drainage main pipe.

[0009] It also includes a public water supply anti-condensation system and an in-plant air temperature sensor, wherein the public water supply anti-condensation system draws water from the technical water supply and drainage main;

[0010] The public water supply anti-condensation system includes a public water supply anti-condensation pipeline and an electric valve, an electromagnetic flowmeter, a temperature sensor, a flow regulating valve, a water supply pump system, a signal processing system, and a system temperature sensor on the pipeline. The system temperature sensor is arranged on the public water supply water intake main pipe. The signal processing system is used to process the temperature difference between the system temperature sensor and the air temperature sensor in the plant. If the temperature difference is greater than 8°C, the electric valve is controlled to open. If the temperature difference is less than 8°C, the electric valve is controlled to close. The electric valve is used to regulate the operation of the public water supply anti-condensation system. The electromagnetic flowmeter and the temperature sensor determine the introduced flow and temperature through real-time monitoring. The flow regulating valve is used to regulate the flow of the public water supply anti-condensation system.

[0011] When the electric valve is opened, the flow regulating valve is opened synchronously, and the flow regulating valve is gradually opened until the temperature difference between the plant temperature sensor and the system temperature sensor is less than 8°C, and the flow regulating valve is fixed at a fixed opening.

[0012] Furthermore, a main flow regulating valve is arranged on the technical water supply and drainage main pipe. If the temperature difference between the temperature sensor in the plant and the system temperature sensor is still greater than 8°C when the flow regulating valve is opened to the maximum, the main flow regulating valve on the technical water supply and drainage main pipe is adjusted to reduce the flow of the main pipe, and then increase the flow on the public water supply anti-condensation pipeline to adjust the temperature difference between the two to be less than 8°C.

[0013] Furthermore, the public water supply anti-condensation system also includes a check valve, which is used to prevent water from the water intake from flowing back to the drain pipe.

[0014] Furthermore, the public water supply anti-condensation system also includes inspection valves, which are respectively arranged on the water inlet and outlet sides of the pipeline for routine and emergency maintenance.

[0015] Furthermore, the water supply pump system includes a water supply pump pipeline and a water supply pump on the pipeline, a differential pressure sensor system, a check valve and a service valve, and the differential pressure sensor system can control the automatic start and stop of the water supply pump.

[0016] Furthermore, a check valve is provided in the water intake section of the public water supply main.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The utility model discloses a public water supply anti-condensation device with a simple structure, consisting only of newly added pipelines and equipment, with low cost, durability and good safety, and is very suitable for the public water supply system of a pumped storage power station; the method steps are easy to implement, the equipment and pipelines are connected to corresponding positions, and a control system is used to perform feedback adjustment on the entire system, which is accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic diagram of the anti-condensation arrangement of the public water supply system of the pumped storage power station.

[0020] Figure numerals: 1. tailwater pipe; 2. public water supply intake main; 3. cooling unit; 4. technical water supply and drainage main; 41. main flow regulating valve; 5. public water supply anti-condensation system; 51. electric valve; 52. electromagnetic flow meter; 53. temperature sensor; 54. flow regulating valve; 55. water supply pump system; 56. signal processing system; 57. system temperature sensor; 58. check valve; 59. inspection valve; 6. air temperature sensor in the plant. DETAILED DESCRIPTION

[0021] The embodiments of the present utility model are described in further detail below in conjunction with the accompanying drawings.

[0022] like Figure 1 As shown, the public water supply anti-condensation device includes a tailwater pipe 1, a public water supply intake main pipe 2, a cooling unit 3, and a technical water supply and drainage main pipe 4. The public water supply intake main pipe 2 takes water from the tailwater pipe 1 to obtain hot water after passing through the cooling unit 3 user, and then flows into the tailwater pipe 1 through the technical water supply and drainage main pipe 4. It also includes a public water supply anti-condensation system 5 and a plant air temperature sensor 6. The public water supply anti-condensation system 5 takes water from the technical water supply and drainage main pipe 4.

[0023] The public water supply system is used to take into account the water supply of the air compressor and the SFC. The public water supply system itself does not have a booster pump, so an additional water supply pump system needs to be connected.

[0024] Specifically, the public water supply anti-condensation system 5 includes a public water supply anti-condensation pipeline and an electric valve 51, an electromagnetic flowmeter 52, a temperature sensor 53, a flow regulating valve 54, a water supply pump system 55, a signal processing system 56, and a system temperature sensor 57. The system temperature sensor 57 is arranged on the public water supply water intake main 2. The signal processing system 56 is used to process the temperature difference between the system temperature sensor 57 and the air temperature sensor 6 in the plant. If the temperature difference is greater than 8°C, the electric valve 51 is controlled to be opened. If the temperature difference is less than 8°C, the electric valve 51 is controlled to be closed. The electric valve 51 is used to regulate the operation of the public water supply anti-condensation system 5. The electromagnetic flowmeter 52 and the temperature sensor 53 determine the introduced flow and temperature through real-time monitoring. The flow regulating valve 54 is used to adjust the flow of the public water supply anti-condensation system 5.

[0025] When the electric valve 51 is opened, the regulating valve 54 is opened synchronously, and the regulating valve 54 is gradually opened until the temperature difference between the plant temperature sensor 53 and the system temperature sensor 57 is less than 8° C., and the regulating valve 54 is fixed in opening.

[0026] A total flow regulating valve 41 is provided on the technical water supply and drainage main pipe 4. If the flow regulating valve 54 is opened to the maximum, and the temperature difference between the air temperature sensor 6 in the factory and the system temperature sensor 57 is still greater than 8°C, the total flow regulating valve 41 on the technical water supply and drainage main pipe 4 is adjusted to reduce the flow of the main pipe, and then increase the flow on the public water supply anti-condensation pipeline, and adjust the temperature difference between the two to be less than 8°C.

[0027] The public water supply anti-condensation system 5 further includes a check valve 58, which is used to prevent water from flowing back from the water intake to the drain pipe.

[0028] The public water supply anti-condensation system 5 further includes a maintenance valve 59 , which is respectively arranged at the water inlet and outlet sides of the pipeline for routine and emergency maintenance.

[0029] The water supply pump system 55 includes a water supply pump pipeline and a water supply pump on the pipeline, a differential pressure sensor system, a check valve and a repair valve. The differential pressure sensor system can control the automatic start and stop of the water supply pump.

[0030] A check valve is provided at the water intake section of the public water supply main 2.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A public water supply anti-condensation device, including a tailwater pipe, a public water supply main pipe, a cooling unit, and a technical water supply and drainage main pipe. The public water supply main pipe takes water from the tailwater pipe to obtain hot water after passing through the cooling unit user, and then flows into the tailwater pipe through the technical water supply and drainage main pipe. The device is characterized by: It also includes a public water supply anti-condensation system and an in-plant air temperature sensor, wherein the public water supply anti-condensation system takes water from the technical water supply and drainage main; The public water supply anti-condensation system includes a public water supply anti-condensation pipeline and an electric valve, an electromagnetic flowmeter, a temperature sensor, a flow regulating valve, a water supply pump system, a signal processing system, and a system temperature sensor on the pipeline. The system temperature sensor is arranged on the public water supply water intake main pipe. The signal processing system is used to process the temperature difference between the system temperature sensor and the air temperature sensor in the plant. If the temperature difference is greater than 8°C, the electric valve is controlled to open. If the temperature difference is less than 8°C, the electric valve is controlled to close. The electric valve is used to regulate the operation of the public water supply anti-condensation system. The electromagnetic flowmeter and the temperature sensor determine the introduced flow and temperature through real-time monitoring. The flow regulating valve is used to regulate the flow of the public water supply anti-condensation system. When the electric valve is opened, the flow regulating valve is opened synchronously, and the flow regulating valve is gradually opened until the temperature difference between the plant temperature sensor and the system temperature sensor is less than 8°C, and the flow regulating valve is fixed at a fixed opening.

2. The public water supply anti-condensation device according to claim 1, characterized in that: A main flow regulating valve is arranged on the technical water supply and drainage main pipe. If the temperature difference between the temperature sensor in the plant and the system temperature sensor is still greater than 8°C when the flow regulating valve is opened to the maximum, the main flow regulating valve on the technical water supply and drainage main pipe is adjusted to reduce the flow of the main pipe, and then increase the flow on the public water supply anti-condensation pipeline to adjust the temperature difference between the two to less than 8°C.

3. The public water supply anti-condensation device according to claim 2, characterized in that: The public water supply anti-condensation system also includes a check valve, which is used to prevent water from flowing back from the water intake to the drain pipe.

4. The public water supply anti-condensation device according to claim 2, characterized in that: The public water supply anti-condensation system also includes inspection valves, which are respectively arranged on the water inlet and outlet sides of the pipeline for routine and emergency maintenance.

5. The public water supply anti-condensation device according to claim 2, characterized in that: The water supply pump system comprises a water supply pump pipeline and a water supply pump on the pipeline, a differential pressure sensor system, a check valve and a service valve. The differential pressure sensor system can control the automatic start and stop of the water supply pump.

6. The public water supply anti-condensation device according to claim 1 or 2, characterized in that: A check valve is provided in the water intake section of the public water supply main intake pipe.

Images