Sewage discharge system for circulating water sump of power plant

Abstract

The utility model relates to the technical field of sump water treatment, and discloses a power plant circulating water sump blowdown system which comprises a first blowdown unit, a second blowdown unit and a self-flowing pipe fitting, the first blowdown unit is arranged below a power plant circulating water system and comprises a first water inlet and a second water inlet, and the second blowdown unit is arranged below the self-flowing pipe fitting. The first water inlet is connected with a power plant circulating water system; the second water inlet is connected with one end of the self-flowing pipe fitting; the second blowdown unit is arranged beside the first blowdown unit, the horizontal height of the second blowdown unit is larger than that of the first blowdown unit, the second blowdown unit comprises a third water inlet and a second water outlet, the third water inlet is connected with the power plant circulating water system, and the second water outlet is connected with the end, away from the second water inlet, of the self-flowing pipe fitting; and the self-flowing pipe fitting is used for transporting sewage in the second sewage discharge unit into the first sewage discharge unit.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology for sump pits, and in particular to a sewage discharge system for a power plant circulating water sump pit. Background Technology

[0002] In power plants, circulating water collection pits are important facilities used to collect and treat substandard wastewater discharged from the thermal system. They are usually located in the condenser circulating water pipe pit, with the elevation set at the lowest point of the plant, so as to collect gravity-flowing wastewater naturally and discharge the accumulated water to the wastewater treatment system outside the plant through a sewage pump.

[0003] Currently, the number of existing circulating water sump sewage systems is directly related to the number of condensers. In power plants, the feedwater pump turbine and the main turbine share a condenser, so only one sump is needed. However, with the increasing size of units, the improvement of feedwater pump and turbine manufacturing capabilities, and the pursuit of high unit performance, feedwater pump turbines are often equipped with a separate condenser. Setting up only one sump for circulating water sump sewage system can no longer meet the sewage discharge needs of power plants. At the same time, setting up multiple circulating water sump sewage systems will greatly increase the investment and operating costs of power plants. Utility Model Content

[0004] The technical problem this invention aims to solve is that existing circulating water collection pit sewage systems, which only have one collection pit, cannot meet the sewage discharge needs of power plants. If multiple circulating water collection pit sewage systems are set up, it will increase the investment and operating costs of power plants.

[0005] To solve the above-mentioned technical problems, this utility model provides a sewage discharge system for a power plant circulating water sump, which includes a first sewage discharge unit, a second sewage discharge unit, and a gravity flow pipe. The first sewage discharge unit is located below the power plant circulating water system and includes a first inlet and a second inlet. The first inlet is connected to the power plant circulating water system, and the second inlet is connected to one end of the gravity flow pipe. The second sewage discharge unit is located beside the first sewage discharge unit, and the horizontal height of the second sewage discharge unit is greater than that of the first sewage discharge unit. The second sewage discharge unit includes a third inlet and a second outlet. The third inlet is connected to the power plant circulating water system, and the second outlet is connected to the end of the gravity flow pipe opposite to the second inlet. The gravity flow pipe is used to transport sewage from the second sewage discharge unit to the first sewage discharge unit.

[0006] Furthermore, there are multiple first and third water inlets.

[0007] In one embodiment, there are multiple second sewage discharge units and gravity flow pipes. Multiple second sewage discharge units are arranged around the outer periphery of the first sewage discharge unit, and a gravity flow pipe is provided between each second sewage discharge unit and the first sewage discharge unit.

[0008] In one embodiment, the first sewage discharge unit further includes a first outlet, and there are two first outlets, one end of which is connected to a sewage pump.

[0009] In one embodiment, there are two sewage pumps, each corresponding to a first outlet, and when one sewage pump is in operation, the other sewage pump is on standby.

[0010] In one embodiment, the system further includes an off-site wastewater treatment unit, with one end of the sewage pump connected to the first sewage discharge unit and the other end connected to the off-site wastewater treatment unit, which is used to receive and treat the wastewater discharged by the sewage pump.

[0011] In one embodiment, the off-site wastewater treatment unit includes a first pipeline and two second pipelines, one end of which is connected in parallel with the first pipeline and the other end of which is connected to a sewage pump.

[0012] In one embodiment, the end of the first pipeline opposite to the second pipeline is connected to a wastewater treatment port, and a first isolation valve is also installed on the first pipeline.

[0013] In one embodiment, each second pipeline is equipped with a check valve and a second isolation valve, with the check valve located between the sewage pump and the second isolation valve.

[0014] In one embodiment, the gravity flow fitting is an inclined pipe body, and the gravity flow fitting is made of corrosion-resistant steel.

[0015] Compared with the prior art, the beneficial effects of this utility model embodiment of a power plant circulating water sump sewage discharge system are as follows: The first sewage discharge unit is located below the power plant circulating water system, facilitating the reception and discharge of sewage. The first sewage discharge unit includes a first inlet and a second inlet. The first inlet is directly connected to the power plant circulating water system to receive sewage from the system. The second inlet is connected to one end of a gravity-flow pipe to receive sewage from the second sewage discharge unit. The second sewage discharge unit is located beside the first sewage discharge unit, and its horizontal height is greater than that of the first sewage discharge unit. This facilitates the use of gravity to allow sewage in the second sewage discharge unit to flow into the first sewage discharge unit. The second sewage discharge unit includes a third inlet and a second outlet. The third inlet is connected to the power plant circulating water system to receive sewage. Another portion of the sewage is connected to the end of the gravity-flow pipe opposite to the second inlet, which is used to discharge the sewage into the gravity-flow pipe and then transport it to the first sewage discharge unit. The gravity-flow pipe acts as a bridge connecting the second sewage discharge unit and the first sewage discharge unit, using gravity to transport the sewage in the second sewage discharge unit to the first sewage discharge unit. Sewage in the power plant's circulating water system enters the first sewage discharge unit through the first inlet, while another portion of the sewage enters the second sewage discharge unit through the third inlet. In the second sewage discharge unit, the sewage flows into the first sewage discharge unit under the action of gravity through the second outlet and the gravity-flow pipe, effectively improving the sewage reception efficiency of the power plant's circulating water sump sewage discharge system. This eliminates the need to set up multiple power plant circulating water sump sewage discharge systems, effectively reducing the investment and operating costs of the power plant. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the sewage discharge system of the power plant circulating water collection pit according to an embodiment of this utility model.

[0017] Figure 2 This is a schematic diagram of the external wastewater treatment unit in the power plant circulating water collection pit sewage system of this utility model embodiment.

[0018] In the diagram, 1 is the first sewage discharge unit; 11 is the first water inlet; 12 is the second water inlet; and 13 is the first water outlet.

[0019] 2. Second sewage discharge unit; 21. Third water inlet; 22. Second water outlet;

[0020] 3. Gravity-fed pipe fittings;

[0021] 4. Off-site wastewater treatment unit; 41. Sewage pump; 42. First pipeline; 421. First isolation valve; 43. Second pipeline; 431. Check valve; 432. Second isolation valve. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0023] In the description of this utility model, it should be understood that when an element is referred to as "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to or indirectly connected to the other element. The terms "mounted," "connected," and "attached" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0024] In the description of this utility model, it should be understood that the terms "height," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0026] like Figures 1 to 2As shown, this utility model preferably provides a sewage discharge system for a power plant circulating water collection pit, which includes a first sewage discharge unit 1, a second sewage discharge unit 2, and a gravity flow pipe 3. The first sewage discharge unit 1 is located below the power plant circulating water system and includes a first inlet 11 and a second inlet 12. The first inlet 11 is connected to the power plant circulating water system, and the second inlet 12 is connected to one end of the gravity flow pipe 3. The second sewage discharge unit 2 is located beside the first sewage discharge unit 1, and the horizontal height of the second sewage discharge unit 2 is greater than that of the first sewage discharge unit 1. The second sewage discharge unit 2 includes a third inlet 21 and a second outlet 22. The third inlet 21 is connected to the power plant circulating water system, and the second outlet 22 is connected to one end of the gravity flow pipe 3 away from the second inlet 12. The gravity flow pipe 3 is used to transport sewage from the second sewage discharge unit 2 to the first sewage discharge unit 1.

[0027] Based on the above technical features, this embodiment of the utility model arranges the first sewage discharge unit 1 below the power plant's circulating water system for easy reception and discharge of sewage. The first sewage discharge unit 1 includes a first inlet 11 and a second inlet 12. The first inlet 11 is directly connected to the power plant's circulating water system to receive sewage from the system. The second inlet 12 is connected to one end of a gravity flow pipe 3 to receive sewage from the second sewage discharge unit 2. The second sewage discharge unit 2 is arranged beside the first sewage discharge unit 1, and its horizontal height is greater than that of the first sewage discharge unit 1. This helps to utilize gravity to allow the sewage in the second sewage discharge unit 2 to flow into the first sewage discharge unit 1. The second sewage discharge unit 2 includes a third inlet 21 and a second outlet 22. The third inlet 21 is connected to the power plant's circulating water system to receive another portion of the sewage. The inlet 22 is connected to the end of the gravity flow pipe 3 away from the second inlet 12, and is used to discharge sewage into the gravity flow pipe 3 and then transport it to the first sewage discharge unit 1. The gravity flow pipe 3 serves as a bridge connecting the second sewage discharge unit 2 and the first sewage discharge unit 1, and uses gravity to transport the sewage in the second sewage discharge unit 2 to the first sewage discharge unit 1. Sewage in the power plant circulating water system enters the first sewage discharge unit 1 through the first inlet 11. At the same time, another part of the sewage enters the second sewage discharge unit 2 through the third inlet 21. In the second sewage discharge unit 2, the sewage flows into the first sewage discharge unit 1 through the second outlet 22 and the gravity flow pipe 3 under the action of gravity. This effectively improves the sewage receiving efficiency of the power plant circulating water sump sewage discharge system, eliminates the need to set up multiple power plant circulating water sump sewage discharge systems, and effectively reduces the investment and operating costs of the power plant.

[0028] As some embodiments of this utility model, such as Figure 1As shown, there are multiple second sewage discharge units 2 and gravity-flow pipes 3. Multiple second sewage discharge units 2 are arranged around the periphery of the first sewage discharge unit 1, and each second sewage discharge unit 2 is connected to the first sewage discharge unit 1 by a gravity-flow pipe 3. The arrangement of multiple second sewage discharge units 2 allows for flexible adjustment of sewage discharge capacity based on the actual needs of the power plant's circulating water system and the amount of sewage generated. This surrounding layout allows sewage to flow into the first sewage discharge unit 1 from multiple directions, improving sewage discharge efficiency. The gravity-flow pipes 3 between each second sewage discharge unit 2 and the first sewage discharge unit 1 utilize gravity to achieve automatic sewage flow, reducing energy consumption from pumping and other processes.

[0029] As some embodiments of this utility model, such as Figure 1 As shown, the first sewage discharge unit 1 also includes two first outlets 13, one end of which is connected to a sewage pump 41. The design of two first outlets 13 can accelerate the discharge speed of sewage, improve sewage discharge efficiency, and make the system more flexible, so as to adapt to different working conditions and sewage discharge requirements.

[0030] As some embodiments of this utility model, such as Figure 1 As shown, there are two sewage pumps 41, each corresponding to one of the first outlets 13. When one sewage pump 41 is operating, the other is on standby. The number of sewage pumps 41 corresponds one-to-one with the number of first outlets 13, meaning one sewage pump 41 is connected to one end of each first outlet 13. This system incorporates a mechanism where one sewage pump 41 is operating while the other is on standby. This design greatly improves system reliability. When a sewage pump 41 fails or requires maintenance, the standby sewage pump 41 can be immediately put into use, ensuring continuous sewage discharge.

[0031] As some embodiments of this utility model, such as Figure 2 As shown, it also includes an off-site wastewater treatment unit 4. One end of a sewage pump 41 is connected to the first sewage discharge unit 1, and the other end is connected to the off-site wastewater treatment unit 4. The off-site wastewater treatment unit 4 is used to receive and treat the wastewater discharged by the sewage pump 41. The first sewage discharge unit 1 includes multiple first outlets 13, each of which is connected to a sewage pump 41. One end of the sewage pump 41 is connected to the first outlet 13 of the first sewage discharge unit 1, which is responsible for controlling the discharge of wastewater. The other end is connected to the off-site wastewater treatment unit 4, which transports the wastewater to the treatment unit for further treatment. The off-site wastewater treatment unit 4 receives and treats the wastewater discharged from the sewage pump 41 and is designed with corresponding treatment processes to ensure that the wastewater meets environmental discharge standards or reuse requirements.

[0032] As some embodiments of this utility model, such as Figure 2As shown, the off-site wastewater treatment unit 4 includes a first pipeline 42 and two second pipelines 43. One end of each of the two second pipelines 43 is connected in parallel with the first pipeline 42, and the other end is connected to a sewage pump 41. The first pipeline 42 serves as the main conveying pipeline of the off-site wastewater treatment unit 4, responsible for transporting the treated wastewater to a designated location, such as a discharge outlet or a reclaimed water tank. One end of each of the two second pipelines 43 is connected in parallel with the first pipeline 42, forming a multi-channel conveying layout. The other end of each of the two second pipelines 43 is connected to the sewage pump 41, responsible for receiving wastewater from the first sewage discharge unit 1. The control of the sewage pump 41 can flexibly adjust the flow rate and discharge time of the wastewater to meet the treatment needs of the off-site wastewater treatment unit 4.

[0033] As some embodiments of this utility model, such as Figure 2 As shown, the end of the first pipeline 42 opposite to the second pipeline 43 is connected to a wastewater treatment port, and a first isolation valve 421 is also installed on the first pipeline 42. The wastewater treatment port is the final outlet for wastewater discharge or reuse. Wastewater treated by the off-site wastewater treatment unit 4 is transported to the wastewater treatment port through the first pipeline 42, and then discharged or reused according to actual needs. The first isolation valve 421 is used to control the opening and closing of the first pipeline 42. When it is necessary to stop wastewater discharge or to carry out pipeline maintenance, the first isolation valve 421 can be closed to cut off the flow of wastewater to the wastewater treatment port. This helps to protect downstream equipment and the environment and prevents the accidental discharge of untreated wastewater.

[0034] As some embodiments of this utility model, such as Figure 2 As shown, each second pipeline 43 is equipped with a check valve 431 and a second isolation valve 432. The check valve 431 is located between the sewage pump 41 and the second isolation valve 432. The check valve 431 is a one-way valve that allows fluid to flow in only one direction, preventing backflow. In the wastewater treatment system, the check valve 431 prevents wastewater from flowing back into the pipeline, ensuring that wastewater flows smoothly to the wastewater treatment port or reuse equipment. The second isolation valve 432 controls the opening and closing of the second pipeline 43. When it is necessary to stop the wastewater discharge from a certain second pipeline 43, perform pipeline maintenance, or switch pipelines, the corresponding second isolation valve 432 can be closed.

[0035] As some embodiments of this utility model, such as Figure 1As shown, the gravity-flow fitting 3 is an inclined pipe body, and the material of the gravity-flow fitting 3 is corrosion-resistant steel. The gravity-flow fitting 3 is designed as an inclined pipe body, which means that wastewater can flow naturally in the pipe by gravity without the need for additional pumping equipment. The steel has good strength and durability, and can withstand pressure changes and physical impacts in the wastewater. At the same time, the corrosion-resistant steel can effectively resist corrosion from chemicals in wastewater and soil, extending the service life of the fitting.

[0036] In summary, the present invention provides a power plant circulating water sump sewage discharge system. Compared with the prior art, its advantages are as follows: The first sewage discharge unit 1 is located below the power plant circulating water system, facilitating the reception and discharge of sewage. The first sewage discharge unit 1 includes a first inlet 11 and a second inlet 12. The first inlet 11 is directly connected to the power plant circulating water system to receive sewage from the system. The second inlet 12 is connected to one end of a gravity-flow pipe 3 to receive sewage from the second sewage discharge unit 2. The second sewage discharge unit 2 is located beside the first sewage discharge unit 1, and its horizontal height is greater than that of the first sewage discharge unit 1. This facilitates the use of gravity to allow sewage in the second sewage discharge unit 2 to flow into the first sewage discharge unit 1. The second sewage discharge unit 2 includes a third inlet 21 and a second outlet 22. The third inlet 21 is connected to the power plant circulating water system to receive sewage from the first outlet 1. Another portion of the sewage is collected. The second outlet 22 is connected to the end of the gravity flow pipe 3 opposite to the second inlet 12, which is used to discharge the sewage into the gravity flow pipe 3 and then transport it to the first sewage discharge unit 1. The gravity flow pipe 3 acts as a bridge connecting the second sewage discharge unit 2 and the first sewage discharge unit 1, using gravity to transport the sewage in the second sewage discharge unit 2 to the first sewage discharge unit 1. The sewage in the power plant circulating water system enters the first sewage discharge unit 1 through the first inlet 11. At the same time, another portion of the sewage enters the second sewage discharge unit 2 through the third inlet 21. In the second sewage discharge unit 2, the sewage flows into the first sewage discharge unit 1 under the action of gravity through the second outlet 22 and the gravity flow pipe 3. This effectively improves the sewage receiving efficiency of the power plant circulating water sump sewage discharge system, eliminates the need to set up multiple power plant circulating water sump sewage discharge systems, and effectively reduces the investment and operating costs of the power plant.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A sewage discharge system for a power plant circulating water sump, used to discharge sewage from the power plant's circulating water system, characterized in that, include: The first sewage discharge unit, the second sewage discharge unit, and gravity-flow pipe fittings The first sewage discharge unit is located below the power plant circulating water system. The first sewage discharge unit includes a first inlet and a second inlet. The first inlet is connected to the power plant circulating water system, and the second inlet is connected to one end of the gravity flow pipe. The second sewage discharge unit is located beside the first sewage discharge unit. The horizontal height of the second sewage discharge unit is greater than that of the first sewage discharge unit. The second sewage discharge unit includes a third inlet and a second outlet. The third inlet is connected to the power plant's circulating water system. The second outlet is connected to the end of the gravity flow pipe opposite to the second inlet. The gravity flow pipe is used to transport sewage from the second sewage discharge unit to the first sewage discharge unit.

2. The power plant circulating water sump sewage system according to claim 1, characterized in that, There are multiple second sewage discharge units and gravity flow pipes. Multiple second sewage discharge units are arranged around the outer periphery of the first sewage discharge unit, and a gravity flow pipe is provided between each second sewage discharge unit and the first sewage discharge unit.

3. The power plant circulating water sump sewage system according to claim 2, characterized in that, The first sewage discharge unit also includes a first water outlet, and there are two first water outlets, with a sewage pump connected to one end of each first water outlet.

4. The power plant circulating water sump sewage system according to claim 3, characterized in that, The number of sewage pumps is two, and each sewage pump is set up in a one-to-one correspondence with the first water outlet. When one of the sewage pumps is in operation, the other sewage pump is on standby.

5. The power plant circulating water sump sewage system according to claim 4, characterized in that, It also includes an off-site wastewater treatment unit. One end of the sewage pump is connected to the first sewage unit, and the other end is connected to the off-site wastewater treatment unit. The off-site wastewater treatment unit is used to receive and treat the wastewater discharged by the sewage pump.

6. The power plant circulating water sump sewage system according to claim 5, characterized in that, The off-site wastewater treatment unit includes a first pipeline and two second pipelines. One end of each of the two second pipelines is connected in parallel with the first pipeline, and the other end is connected to the sewage pump.

7. The power plant circulating water sump sewage system according to claim 6, characterized in that, The end of the first pipeline opposite to the second pipeline is connected to a wastewater treatment port, and a first isolation valve is also installed on the first pipeline.

8. The power plant circulating water sump sewage system according to claim 7, characterized in that, Each of the second pipelines is equipped with a check valve and a second isolation valve, with the check valve located between the sewage pump and the second isolation valve.

9. The power plant circulating water sump sewage system according to claim 1, characterized in that, The self-flowing pipe is an inclined pipe body, and the material of the self-flowing pipe is corrosion-resistant steel.

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