Feed pump system of thermal generator set with power of more than 300MW
By setting up an isolation valve in the electric water supply pump of a thermal power generator set above 300MW to control the circulation of cooling water, the problem of waste of cooling water in the standby state of the electric water supply pump is solved, and the efficient utilization of cooling water is achieved.
Patent Information
- Application Number
- CN202421566084.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-04
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-07-04
AI Technical Summary
The electric water supply pump of thermal power generator sets above 300MW consumes a lot of cooling water in standby state, resulting in waste of cooling water.
A water supply pump system for thermal power generator sets above 300 MW is designed. By setting a first isolation valve and a second isolation valve in the electric water supply pump, the circulation of cooling water is controlled to ensure that the cooling water consumption is reduced in the standby state of the electric water supply pump.
It effectively reduces the consumption of cooling water, avoids the waste of cooling water, and improves the operating efficiency of the generator set.
Smart Images
Figure CN223018889U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thermal power generating units, and specifically relates to a feed water pump system for thermal power generating units above 300MW. Background Art
[0002] Thermal power generating units above 300MW in China are all equipped with steam-driven feed water pumps and electric feed water pumps. The advantage of the electric feed water pump is that it is simple to start and can reach the rated output load in a short time. The disadvantage is that it consumes a large amount of electricity. Therefore, when the unit is operating normally, a combined mode of using the steam-driven feed water pump for operation and the electric feed water pump for standby is adopted; in the prior art, the electric feed water pump also consumes a large amount of cooling water in the standby state, resulting in waste of cooling water. Content of the Utility Model
[0003] The main purpose of the utility model is to provide a feed water pump system for thermal power generating units above 300MW, so as to solve the problem in the above-mentioned prior art that the electric feed water pump of thermal power generating units above 300MW also consumes a large amount of cooling water in the standby state, resulting in waste of cooling water.
[0004] To achieve the above purpose, the utility model provides a feed water pump system for thermal power generating units above 300MW, which includes a steam-driven feed water pump and an electric feed water pump. The electric feed water pump includes a motor and a pump body, and the motor is connected to the pump body through a hydraulic coupling; an air cooler is arranged in the motor, and the air cooler is connected to a cooling water pipe through a first circulating water pipe; both ends of the first circulating water pipe are installed with first isolation valves for isolating itself.
[0005] Further, the hydraulic coupling is connected with a working oil cooler through a working oil circulating pipe, the working oil cooler is connected to the cooling water pipe through a second circulating water pipe, and the second circulating water pipe and the working oil circulating pipe exchange heat through the working oil cooler; both ends of the second circulating water pipe are installed with second isolation valves for isolating itself.
[0006] Further, the first isolation valve and the second isolation valve are electrically connected to the electric feed water pump. When the electric feed water pump shuts down, the first isolation valve and the second isolation valve close or close slightly. When the electric feed water pump starts, the first isolation valve and the second isolation valve open completely.
[0007] Further, a lubricating oil circulating pipe for lubricating the bearings is arranged in the electric feed water pump. The lubricating oil circulating pipe is connected with a lubricating oil cooler, the lubricating oil cooler is connected to the cooling water pipe through a third circulating water pipe, and the lubricating oil circulating pipe and the third circulating water pipe exchange heat through the lubricating oil cooler.
[0008] Further, the cooling water pipe includes a cooling water inlet pipe and a cooling water return pipe.
[0009] Further, a first bypass is connected in parallel to the positions on both sides of the first isolation valve on the first circulating water pipe. A first bypass valve is provided on the first bypass. A first maintenance isolation valve is provided at the position between the intersection of the first bypass and the first circulating water pipe and on both sides of the first isolation valve on the first circulating water pipe.
[0010] Further, a second bypass is connected in parallel to the positions on both sides of the second isolation valve on the second circulating water pipe. A second bypass valve is provided on the second bypass. A second maintenance isolation valve is provided at the position between the intersection of the second bypass and the second circulating water pipe and on both sides of the second isolation valve on the second circulating water pipe.
[0011] By providing the first isolation valve and the second isolation valve, the present utility model can close or throttle down the first isolation valve and the second isolation valve when the electric feed water pump is in standby state, which can reduce the consumption of cooling water and avoid waste of cooling water. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.
[0013] Figure 1 It is a schematic structural diagram of Embodiment 1;
[0014] Figure 2 It is a schematic structural diagram of the first bypass in Embodiment 2;
[0015] Figure 3 It is a schematic structural diagram of the second bypass in Embodiment 2.
[0016] In the figure: 1, motor; 2, pump body; 3, hydraulic coupling; 4, first circulating water pipe; 5, cooling water pipe; 501, cooling water inlet pipe; 502, cooling water return pipe; 6, first isolation valve; 7, lubricating oil circulating pipe; 8, lubricating oil cooler; 9, third circulating water pipe; 10, second isolation valve; 11, working oil circulating pipe; 12, working oil cooler; 13, second circulating water pipe; 14, first bypass; 15, first maintenance isolation valve; 16, second bypass; 17, second bypass valve; 18, second maintenance isolation valve; 19, first bypass valve. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.
[0018] Embodiment 1
[0019] As Figures 1 to 3As shown in the figure, a feed water pump system for a thermal power generating unit with a capacity of over 300 MW includes a steam-driven feed water pump and an electric feed water pump. The electric feed water pump includes a motor 1 and a pump body 2. The output shaft of the motor 1 is connected to the input shaft of the pump body 2 through a hydraulic coupling 3. An air cooler is provided inside the motor 1, and the air cooler is connected to a cooling water pipe 5 through a first circulating water pipe 4. Both ends of the first circulating water pipe 4 are installed with first isolation valves 6 for isolating itself.
[0020] The hydraulic coupling 3 is connected to a working oil cooler 12 through a working oil circulating pipe 11. The working oil cooler 12 is connected to the cooling water pipe 5 through a second circulating water pipe 13. The second circulating water pipe 13 and the working oil circulating pipe 11 exchange heat through the working oil cooler 12. Both ends of the second circulating water pipe 13 are installed with second isolation valves 10 for isolating itself.
[0021] Both the first isolation valve 6 and the second isolation valve 10 are air-closed pneumatic control valves. The first isolation valve 6 and the second isolation valve 10 are electrically connected to the electric feed water pump. When the electric feed water pump shuts down, the first isolation valve 6 and the second isolation valve 10 close or close slightly. When the electric feed water pump starts, the first isolation valve 6 and the second isolation valve 10 open fully.
[0022] A lubricating oil circulating pipe 7 for lubricating the bearings is provided inside the electric feed water pump. The lubricating oil circulating pipe 7 is connected to a lubricating oil cooler 8. The lubricating oil cooler 8 is connected to the cooling water pipe 5 through a third circulating water pipe 9. The lubricating oil circulating pipe 7 and the third circulating water pipe 9 exchange heat through the lubricating oil cooler 8.
[0023] The cooling water pipe 5 includes a cooling water inlet pipe 501 and a cooling water return pipe 502.
[0024] According to the trial operation, after the electric feed water pump starts, the working oil temperature will not affect the safe operation of the pump impeller and turbine within 2 minutes. The air cooler of the motor 1 will not affect the safe operation of the motor within 10 minutes without cooling water input. Without cooling water input, the lubricating oil cooler 8 can damage the bearings in less than half a minute. When the lubricating oil cooler 8 inputs cooling water after the electric feed water pump starts, there will be a problem that the lubricating oil cannot be cooled in time. Therefore, the cooling water of the lubricating oil cooler 8 should be normally input when the electric feed water pump is in standby state. For the working oil cooler 12 and the air cooler of the motor 1, inputting cooling water after the electric feed water pump starts can meet the safety requirements of the electric feed water pump.
[0025] Embodiment 2
[0026] Embodiment 2 also provides a feed water pump system for a thermal power generating unit with a capacity of more than 300 MW. The difference between Embodiment 2 and Embodiment 1 is only that a first bypass 14 is connected in parallel at positions on both sides of the first isolation valve 6 on the first circulating water pipe 4. A first bypass valve 19 is provided on the first bypass 14. A first maintenance isolation valve 15 is provided at a position on the first circulating water pipe 4 between the intersection of the first bypass 14 and the first circulating water pipe 4 and on both sides of the first isolation valve 6.
[0027] A second bypass 16 is connected in parallel at positions on both sides of the second isolation valve 10 on the second circulating water pipe 13. A second bypass valve 17 is provided on the second bypass 16. A second maintenance isolation valve 18 is provided at a position on the second circulating water pipe 13 between the intersection of the second bypass 16 and the second circulating water pipe 13 and on both sides of the second isolation valve 10.
[0028] By providing the bypass, the bypass valve and the maintenance isolation valve, it is possible to isolate the first isolation valve 6 and the second isolation valve 10 when problems occur, so as to achieve online maintenance without shutting down the machine.
[0029] By providing the first isolation valve 6 and the second isolation valve 10 in the above embodiments, when the motor-driven feed water pump is in standby state, the first isolation valve 6 and the second isolation valve 10 can be closed or throttled, which can reduce the consumption of cooling water and avoid waste of cooling water.
[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A feedwater pump system for a thermal power generating unit with a capacity of 300MW or more, comprising a steam-driven feedwater pump and an electric feedwater pump, characterized in that: The electric water supply pump comprises a motor (1) and a pump body (2), wherein the motor (1) and the pump body (2) are connected via a hydraulic coupler (3); an air cooler is provided inside the motor (1), and the air cooler is connected to a cooling water pipe (5) via a first circulating water pipe (4); first isolation valves (6) for isolating the first circulating water pipe (4) are installed at both ends of the first circulating water pipe (4); The hydraulic coupling (3) is connected to a working oil cooler (12) via a working oil circulation pipe (11); the working oil cooler (12) is connected to a cooling water pipe (5) via a second circulating water pipe (13); the second circulating water pipe (13) and the working oil circulation pipe (11) exchange heat via the working oil cooler (12); second isolation valves (10) for isolating the second circulating water pipe (13) are installed at both ends of the second circulating water pipe (13); The first isolation valve (6) and the second isolation valve (10) are electrically connected to the electric water supply pump. When the electric water supply pump is shut down, the first isolation valve (6) and the second isolation valve (10) are closed or turned down. When the electric water supply pump is started, the first isolation valve (6) and the second isolation valve (10) are fully opened.
2. The feedwater pump system for a thermal power generator unit with a capacity of 300MW or more as claimed in claim 1, characterized in that: The electric water supply pump is provided with a lubricating oil circulation pipe (7) for adding lubricating oil to the bearings. The lubricating oil circulation pipe (7) is connected to a lubricating oil cooler (8). The lubricating oil cooler (8) is connected to the cooling water pipe (5) via a third circulating water pipe (9). The lubricating oil circulation pipe (7) and the third circulating water pipe (9) exchange heat via the lubricating oil cooler (8).
3. The feedwater pump system for a thermal power generator unit with a capacity of 300MW or more as claimed in claim 1, characterized in that: The cooling water pipe (5) comprises a cooling water inlet pipe (501) and a cooling water return pipe (502).
4. The feedwater pump system for a thermal power generator unit with a capacity of 300 MW or more as claimed in claim 1, characterized in that: A first bypass (14) is connected in parallel to a position on both sides of the first isolation valve (6) on the first circulating water pipe (4), a first bypass valve (19) is provided on the first bypass (14), and a first maintenance isolation valve (15) is provided on the first circulating water pipe (4) at a position between the intersection of the first bypass (14) and the first circulating water pipe (4) and on both sides of the first isolation valve (6).
5. The feedwater pump system for a thermal power generator unit with a capacity of 300 MW or more as claimed in claim 1, characterized in that: A second bypass (16) is connected in parallel to a position on both sides of the second isolation valve (10) on the second circulating water pipe (13), a second bypass valve (17) is provided on the second bypass (16), and a second maintenance isolation valve (18) is provided on the second circulating water pipe (13) at a position between the intersection of the second bypass (16) and the second circulating water pipe (13) and on both sides of the second isolation valve (10).