Waste steam recovery device of drain tank of thermal power plant
By designing the waste steam recovery device for the water-removing tank of the thermal power plant, the steam heat emitted from the exhaust outlet is recovered by using the spray cooling tower and the expansion tank to recover the steam heat from the exhaust outlet of the thermal power plant, the problem of steam emitting outlet of the steam drain in the thermal power plant is solved, and heat recovery, environmental protection and safety performance are improved.
Patent Information
- Application Number
- CN202421836495.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The steam emitting problem of the exhaust outlet of the existing thermal power plant water drain tanks leads to heat loss, environmental and safety threats.
A waste steam recovery device for the thermal power plant water-breathing tank including a spray cooling tower, exhaust pipe, drain pipe and expansion container is designed to reduce the water temperature of the water-breathing tank and improve safety performance by retrieving the steam heat emitted from the exhaust port.
Effectively reduce steam emitting at the exhaust port, protect the environment, improve energy utilization, reduce water temperature of the water drain tank, improve safety performance, and thus extend the service life of the equipment.
Smart Images
Figure CN223036995U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of recovery devices, and relates to a waste steam recovery device for a drain tank in a thermal power plant. Background Art
[0002] As the name implies, a drain tank is used to discharge sediments and moisture in the system to maintain the stable operation of the system. In a fluid system, if there is a large amount of moisture, impurities, etc. in the fluid to be treated, these pollutants will accumulate in the system pipelines and equipment over time, causing problems such as equipment blockage, rust, and corrosion. Therefore, the role of the drain tank is to regularly discharge these pollutants from the system to maintain the stability of the system. The basic working principle of the drain tank is to discharge the moisture and impurities accumulated in the pipelines and equipment through the drain port installed at the lower part. However, the long-term steaming of the steam outlet pipe of the existing power plant drain tank is a common problem in thermal power plants. This common problem not only causes heat loss and serious waste, but also has a serious impact on the environment and safety. Therefore, a waste steam recovery device for a thermal power plant drain tank is designed to overcome the above problems. Content of the Utility Model
[0003] The purpose of the utility model is to overcome the deficiencies existing in the prior art, and to provide a waste steam recovery device for a thermal power plant drain tank with a simple and reasonable structure, which reduces steaming at the exhaust port, improves the environment, recovers the steam heat of the steam outlet pipe, reduces the water temperature of the drain tank, and improves the safety performance.
[0004] The utility model is realized by the following technical solutions: a waste steam recovery device for a thermal power plant drain tank, including a drain tank, a spray cooling tower is installed on the top of the drain tank, a steam exhaust pipe with a steam exhaust port is arranged at the top of the spray cooling tower, and a first drain pipe with a drain port is arranged at the bottom of the spray cooling tower. The first drain pipe extends into the drain tank and has a certain distance from the bottom of the drain tank. A first pipe and a second pipe are respectively arranged at the upper middle position and the middle position of the side of the spray cooling tower. The first pipe is connected to the demineralized water main pipe, and the second pipe is connected to a flash tank arranged on the top of the drain tank on one side of the spray cooling tower. A third pipe is arranged at the top of the flash tank for connecting high-pressure drain water. A fourth pipe is arranged on the side of the flash tank and is connected to the demineralized water main pipe, and a second drain pipe is arranged at the bottom of the flash tank. The second drain pipe extends into the drain tank and has a certain distance from the bottom of the drain tank.
[0005] Preferably: a fifth pipe is arranged at the middle position of one side of the drain tank, a drain pump is arranged on the fifth pipe, and a first valve and a second valve are respectively arranged on the fifth pipe before and after the drain pump. The fifth pipe is connected to the deaerator and is respectively connected to the fourth pipe of the flash tank and the demineralized water main pipe through a connecting pipe with a third valve.
[0006] Preferably, on one side of the drain tank away from the fifth pipe, there are an overflow port and a water outlet arranged in a high-low layout. The overflow port is arranged at a position above the middle of the side of the drain tank, and the water outlet is arranged at a position close to the bottom of the side of the drain tank. An overflow pipe with an overflow valve and a drain pipe with a drain valve are respectively arranged at the overflow port and the water outlet. The overflow pipe is connected to the drain pipe, and both are connected to the trench for convenient drainage.
[0007] Preferably, temperature sensors and pressure sensors are arranged on both the drain tank and the spray cooling tower to respectively detect the temperature and pressure values of the drain tank and the spray cooling tower.
[0008] Preferably, control valves are arranged at positions of the fifth pipe of the drain tank close to the deaerator, the second pipe, the third pipe, the fourth pipe, the fifth pipe, the first pipe, and the demineralized water main pipe.
[0009] The beneficial effects of the present utility model are as follows:
[0010] 1. The waste steam recovery device of the drain tank of the thermal power plant designed by the present utility model can recover the steam heat of the steam pipe at the exhaust port, protecting the environment and improving the energy utilization rate at the same time.
[0011] 2. The present utility model can greatly reduce the steam emission at the exhaust port, thus protecting the environment.
[0012] 3. The setting of the present utility model can greatly reduce the water temperature of the drain tank, improve the safety performance, and thus improve the overall service life. Description of the Drawings
[0013] Figure 1 It is a schematic diagram of the overall structure of the present utility model. Detailed Embodiments
[0014] To enable those of ordinary skill in the art to more clearly understand the purpose, technical solution, and advantages of the present utility model, the following further elaborates on the present utility model in conjunction with the drawings and embodiments.
[0015] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal", "vertical", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model, rather than indicating or implying that the device or component referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.
[0016] The following will introduce the present utility model in detail with reference to the drawings: As Figure 1As shown, a waste steam recovery device for a drain tank of a thermal power plant comprises a drain tank 1, a spray cooling tower 2 is installed on the top of the drain tank 1, an exhaust pipe 4 with an exhaust port 3 is arranged on the top of the spray cooling tower 2, and a first drainage pipe 6 with a drain port 5 is arranged at the bottom thereof, the first drainage pipe 6 extends into the drain tank 1 and is at a certain distance from the bottom of the drain tank, a first pipe 7 and a second pipe 8 are respectively arranged at the upper middle position of the side body and the middle position of the side body of the spray cooling tower 2, wherein the first pipe 7 is connected to a desalted water main pipe 9, the second pipe 8 is connected to an expansion tank 10 arranged on the top of the drain tank 1 and on one side of the spray cooling tower 2, a third pipe 11 is arranged on the top of the expansion tank 10 for connecting to a high-pressure drain 13, a fourth pipe 12 is arranged on the side of the expansion tank 10 and is connected to the desalted water main pipe 9, and a second drainage pipe 14 is arranged at the bottom of the expansion tank 10, the second drainage pipe 14 extends into the drain tank 1 and is at a certain distance from the bottom of the drain tank 1.
[0017] The expansion tank in the utility model is an important accessory of the drain tank, which is mainly used to increase the sewage discharge capacity and enhance the sewage discharge efficiency. In special environments such as high temperature and high pressure, the sewage discharge volume of the drain tank is sometimes not large enough, and the help of the drain expansion tank is needed at this time. The basic working principle of the expansion tank is to discharge the discharged water, impurities and other substances more thoroughly by increasing the capacity, so as to maintain the normal operation of the equipment and system.
[0018] A fifth pipeline 15 is provided at the middle position of one side of the drain tank 1, a drain pump 16 is provided on the fifth pipeline 15, and a first valve 17 and a second valve 18 are respectively provided on the fifth pipeline 15 before and after the drain pump 16. The fifth pipeline 15 is connected to a deaerator 19, and is respectively connected to the fourth pipeline 12 of the expansion tank 10 and the desalted water main pipe 9 through a connecting pipeline 20 with a third valve 21.
[0019] The drain tank 1 is provided with an overflow port 22 and a water outlet 23 arranged at different heights on the side thereof away from the fifth pipe 15. The overflow port 22 is provided at an upper middle position of the side of the drain tank 1, and the water outlet 23 is provided at a position near the bottom of the side of the drain tank 1. An overflow pipe 25 with an overflow valve 24 and a drain pipe 27 with a drain valve 26 are respectively installed at the overflow port 22 and the water outlet 23. The overflow pipe 25 is connected to the drain pipe 27, and both are connected to the ditch for convenient drainage.
[0020] The drain tank 1 and the spray cooling tower 2 are both provided with a temperature sensor 28 and a pressure sensor 29 for detecting the temperature and pressure values of the drain tank and the spray cooling tower respectively.
[0021] The utility model can implement the detection of the temperature and pressure values of the drain tank and the spray cooling tower through the arranged temperature sensor and pressure sensor, which is convenient for the staff to carry out maintenance.
[0022] Control valves 30 are arranged at the position where the fifth pipeline 15 of the drain tank 1 is close to the deaerator 19, as well as on the first pipeline 7, the second pipeline 8, the third pipeline 11, the fourth pipeline 12, the fifth pipeline 15 and the demineralized water main pipe 9. Of course, the valves in the utility model can all be electrically controlled valves and are controlled by a PLC system, which is convenient for the normal operation of the whole utility model.
[0023] The waste steam recovery device of the drain tank of the thermal power plant designed by the utility model can recover the steam heat of the steam pipe at the exhaust port, protect the environment and improve the energy utilization rate at the same time. It can greatly reduce the steam emission at the exhaust port, thus protecting the environment. It can also greatly reduce the water temperature of the drain tank and improve the safety performance, thereby improving the overall service life.
[0024] Through the setting of the utility model, the following can be achieved: recovering 10 tons of steam per day, improving the cooling efficiency, reducing the shutdown maintenance time, and recovering the heat energy of the cooling water and transporting it to the hot water collection tank for utilization.
[0025] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.
[0026] The specific embodiments described herein are only illustrative of the principles and effects of the utility model and are not intended to limit the utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the utility model should still be covered by the claims of the utility model.
Claims
1. A waste steam recovery device for a drain tank of a thermal power plant, comprising a drain tank (1), characterized in that: A spray cooling tower (2) is installed on the top of the drain tank (1). A steam exhaust pipe (4) with a steam exhaust port (3) is arranged on the top of the spray cooling tower (2). A first drainage pipe (6) with a drainage port (5) is arranged at the bottom of the spray cooling tower. The first drainage pipe (6) extends into the drain tank (1) and is at a certain distance from the bottom of the drain tank. A first pipe (7) and a second pipe (8) are arranged at the upper middle position and the middle position of the side of the spray cooling tower (2), respectively. The first pipe (7) is connected to the desalted water main pipe (9). The second pipe (8) is connected to an expansion tank (10) arranged on the top of the drain tank (1) and located on one side of the spray cooling tower (2); a third pipe (11) is arranged on the top of the expansion tank (10) for connecting to the high-pressure drain (13); a fourth pipe (12) is arranged on the side of the expansion tank (10) and connected to the demineralized water main pipe (9); and a second drainage pipe (14) is arranged at the bottom of the expansion tank (10); the second drainage pipe (14) extends into the drain tank (1) and is at a certain distance from the bottom of the drain tank (1).
2. The waste steam recovery device of the thermal power plant drain tank according to claim 1 is characterized in that: A fifth pipeline (15) is provided at a middle position on one side of the drain tank (1), a drain pump (16) is provided on the fifth pipeline (15), and a first valve (17) and a second valve (18) are provided on the fifth pipeline (15) at positions before and after the drain pump (16), respectively. The fifth pipeline (15) is connected to a deoxidizer (19), and is connected to a fourth pipeline (12) of the expansion tank (10) and a desalted water main pipe (9) via a connecting pipeline (20) with a third valve (21).
3. The waste steam recovery device of the thermal power plant drain tank according to claim 2 is characterized in that: An overflow port (22) and a water outlet (23) arranged in a high and low arrangement are respectively arranged on the side of the drain box (1) away from the fifth pipe (15); the overflow port (22) is arranged at an upper middle position of the side of the drain box (1); the water outlet (23) is arranged at a position close to the bottom of the side of the drain box (1); an overflow pipe (25) with an overflow valve (24) and a drain pipe (27) with a drain valve (26) are respectively installed at the overflow port (22) and the water outlet (23); the overflow pipe (25) and the drain pipe (27) are connected and both are connected to the ditch for convenient drainage.
4. The waste steam recovery device of the thermal power plant drain tank according to claim 3 is characterized in that: The drain tank (1) and the spray cooling tower (2) are both provided with a temperature sensor (28) and a pressure sensor (29) for respectively detecting the temperature and pressure values of the drain tank and the spray cooling tower.
5. The waste steam recovery device of the thermal power plant drain tank according to claim 4 is characterized in that: Control valves (30) are provided at a position of the fifth pipeline (15) of the drain tank (1) close to the deaerator (19), as well as on the first pipeline (7), the second pipeline (8), the third pipeline (11), the fourth pipeline (12), the fifth pipeline (15) and the desalted water main pipeline (9).