Spraying device for exhaust hood of high-temperature and high-pressure steam turbine

Abstract

The utility model relates to the technical field of spraying devices, and provides a high-temperature and high-pressure steam turbine exhaust hood spraying device which comprises a steam turbine exhaust hood, a condenser, a drainage assembly, a condensate polishing system, a water supply assembly, a first spraying assembly and a second spraying assembly. The water drainage assembly feeds outlet water of the condenser into the condensate polishing system, the water supply assembly feeds water treated by the condensate polishing system to the first spraying assembly and the second spraying assembly, and the first spraying assembly is arranged at the steam exhaust port. According to the steam turbine exhaust hood, condensed water serves as a spraying medium, the scaling and blocking risks of a spray head and a pipeline can be reduced, the service life of equipment can be prolonged, the maintenance cost can be reduced, the first spraying assembly sprays a steam exhaust port of the steam turbine exhaust hood, the steam exhaust temperature is reduced, and the second spraying assembly sprays the bottom of the steam turbine exhaust hood; the temperature uniformity of the whole steam turbine exhaust hood is improved, and the problem of local overheating possibly occurring at the bottom of the steam turbine exhaust hood is solved.

Description

Technical Field

[0001] This application relates to the field of spray device technology, and more specifically, to a high-temperature and high-pressure steam turbine exhaust cylinder spray device. Background Technology

[0002] A steam turbine is a rotating power device that converts the thermal energy of steam into mechanical energy. High-temperature and high-pressure steam turbine generator sets are used to convert various forms of energy generated within an enterprise into electrical energy to achieve local energy utilization and improve the autonomy and flexibility of energy supply.

[0003] During the operation of high-temperature and high-pressure steam turbine generator sets, excessively high exhaust steam temperature can have many adverse effects on the unit. In order to improve the unit's vacuum and reduce the exhaust steam temperature, water is often sprayed into the turbine exhaust cylinder to lower its temperature. After the temperature of the turbine exhaust cylinder is reduced, the saturation pressure of the exhaust steam will also decrease. The reduction in exhaust steam pressure helps to improve the unit's vacuum. The increase in the unit's vacuum increases the available enthalpy drop of steam in the turbine, enhances its work capacity, and thus improves the turbine's thermal efficiency.

[0004] However, existing technologies only install spray devices at the exhaust port of the turbine exhaust cylinder, which can lead to localized overheating at the bottom of the turbine exhaust cylinder. This localized overheating can cause cylinder deformation, seal failure, or even equipment damage. Furthermore, existing technologies often use industrial water as the spray medium, which is prone to scaling in pipes and nozzles, increasing the risk of blockage and raising equipment maintenance costs. Utility Model Content

[0005] The purpose of this application is to provide a high-temperature and high-pressure steam turbine exhaust cylinder spraying device to solve the problem of local overheating at the bottom of the steam turbine exhaust cylinder and reduce the risk of scale buildup and blockage inside the pipes and nozzles.

[0006] This application provides a high-temperature, high-pressure steam turbine exhaust cylinder spraying device, which adopts the following technical solution:

[0007] A high-temperature and high-pressure steam turbine exhaust cylinder spraying device includes a steam turbine exhaust cylinder, a condenser, a drainage assembly, a condensate polishing system, a water supply assembly, a first spraying assembly, and a second spraying assembly. The condenser is connected to the steam turbine exhaust cylinder. The drainage assembly is used to send the condenser outlet water into the condensate polishing system. The water supply assembly is used to send the water treated by the condensate polishing system to the first spraying assembly and the second spraying assembly. The first spraying assembly is located at the exhaust port of the steam turbine exhaust cylinder, and the second spraying assembly is located at the bottom of the steam turbine exhaust cylinder.

[0008] Preferably, the drainage assembly includes a first condensate pump and a second condensate pump, both of which are disposed between the condenser and the condensate polishing system.

[0009] Preferably, both the first condensate pump and the second condensate pump are equipped with check valves at their outlets.

[0010] Preferably, the water supply assembly includes a water supply pipe, a first branch pipe, and a second branch pipe. The water supply pipe is connected to the condensate polishing system. The first branch pipe is disposed between the first spray assembly and the condensate polishing system, and the second branch pipe is disposed between the second spray assembly and the condensate polishing system.

[0011] Preferably, both the first branch pipe and the second branch pipe are provided with a first control valve, a regulating valve, and a second control valve, with the regulating valve located between the first control valve and the second control valve.

[0012] Preferably, both the first control valve and the second control valve are gate valves, and the regulating valve is an electric valve.

[0013] Preferably, the first spray assembly includes a first spray pipe and a plurality of first nozzles, the first spray pipe is connected to the first branch pipe, the first nozzles are disposed on the first spray pipe, and the plurality of first nozzles are arranged in a ring array or a rectangular array.

[0014] Preferably, the first nozzle is a centrifugal nozzle, the first nozzle is arranged at an angle, the angle between the spray direction of the first nozzle and the exhaust flow direction is 10° to 20°, and the spray angle of the first nozzle is 110° to 120°.

[0015] Preferably, the second spray assembly includes a second spray pipe and a plurality of second nozzles, the second spray pipe is connected to the second branch pipe, the second spray pipe has a C-shaped structure, and the second nozzles are disposed on the second spray pipe.

[0016] Preferably, the condensate polishing system is connected to a shaft seal heater.

[0017] Compared with the prior art, the beneficial effects of this application are as follows:

[0018] (1) This application uses condensate after fine treatment by the condensate fine treatment system as the spray medium. The condensate has relatively low impurity content and low dissolved oxygen content, which can reduce the risk of scaling and clogging of nozzles and pipes, which is conducive to extending the service life of the equipment and reducing the maintenance cost of the equipment.

[0019] (2) This application sets up a first spray assembly and a second spray assembly. The first spray assembly sprays the exhaust port of the turbine exhaust cylinder to reduce the exhaust temperature, and the second spray assembly sprays the bottom of the turbine exhaust cylinder to improve the temperature uniformity of the entire turbine exhaust cylinder and solves the problem of local overheating that may occur at the bottom of the turbine exhaust cylinder. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the first spray assembly of this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the second spray assembly of this utility model;

[0024] Figure 4 This is a structural schematic diagram of the exhaust direction and spray direction of this utility model.

[0025] In the diagram: 1. Steam turbine exhaust cylinder; 2. Condenser; 3. Drainage assembly; 4. Condensate polishing system; 5. Water supply assembly; 6. First spray assembly; 7. Second spray assembly; 8. First condensate pump; 9. Second condensate pump; 10. Check valve; 11. Water supply pipe; 12. First branch pipe; 13. Second branch pipe; 14. First control valve; 15. Regulating valve; 16. Second control valve; 17. First spray pipe; 18. First nozzle; 19. Second spray pipe; 20. Second nozzle; 21. Shaft seal heater. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not 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 on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] Example

[0033] like Figure 1-4As shown in the embodiment of this application, the high-temperature and high-pressure steam turbine exhaust cylinder spraying device includes a steam turbine exhaust cylinder 1, a condenser 2, a drainage component 3, a condensate polishing system 4, a water supply component 5, a first spraying component 6, and a second spraying component 7. The condenser 2 is connected to the steam turbine exhaust cylinder 1. The drainage component 3 is used to send the condensate outlet water from the condenser 2 into the condensate polishing system 4. The water supply component 5 is used to send the water treated by the condensate polishing system 4 to the first spraying component 6 and the second spraying component 7. The first spraying component 6 is located at the exhaust port of the steam turbine exhaust cylinder 1, and the second spraying component 7 is located at the bottom of the steam turbine exhaust cylinder 1.

[0034] During operation, the water supply component 5 delivers the water treated by the condensate polishing system 4 to the first spray component 6 and the second spray component 7. The first spray component 6 sprays the exhaust port of the turbine exhaust cylinder 1 to reduce the exhaust temperature, while the second spray component 7 sprays the bottom of the turbine exhaust cylinder 1, improving the temperature uniformity of the entire turbine exhaust cylinder 1 and solving the problem of local overheating that may occur at the bottom of the turbine exhaust cylinder 1.

[0035] Steam from the turbine exhaust cylinder 1 enters the condenser 2, and the drainage assembly 3 sends the condensate from the condenser 2 to the condensate polishing system 4. The condensate polishing system 4 polishes the condensate from the condenser 2. Because the impurity content in the polished condensate is relatively low, the risk of scaling and clogging of nozzles and pipes can be reduced. The dissolved oxygen content is also low, which helps to extend the service life of the equipment, reduce the maintenance cost of the equipment, and ensure the stable operation of the system.

[0036] In this embodiment, the drainage component 3 includes a first condensate pump 8 and a second condensate pump 9. Both the first condensate pump 8 and the second condensate pump 9 are located between the condenser 2 and the condensate polishing system 4. The first condensate pump 8 and the second condensate pump 9 are used to pump the condensate outlet water from the condenser 2 into the condensate polishing system 4.

[0037] In this embodiment, a check valve 10 is provided at the outlet of both the first condensate pump 8 and the second condensate pump 9. The check valve 10 is used to prevent water backflow and plays a protective role for the first condensate pump 8 and the second condensate pump 9.

[0038] In this embodiment, the water supply component 5 includes a water supply pipe 11, a first branch pipe 12, and a second branch pipe 13. The water supply pipe 11 is connected to the condensate polishing system 4. The first branch pipe 12 is located between the first spray component 6 and the condensate polishing system 4. The second branch pipe 13 is located between the second spray component 7 and the condensate polishing system 4. The outlet pressure range of the first condensate pump 8 and the second condensate pump 9 is usually between 1.5 and 3.0 MPa, so that the outlet water has sufficient pressure to meet the water supply needs of the water supply pipe 11, the first branch pipe 12, and the second branch pipe 13.

[0039] In this embodiment, a first control valve 14, a regulating valve 15, and a second control valve 16 are provided on both the first branch pipe 12 and the second branch pipe 13. The regulating valve 15 is located between the first control valve 14 and the second control valve 16. The arrangement of the first control valve 14, the regulating valve 15, and the second control valve 16 makes it easy to adjust the water spray volume separately according to the actual situation. Furthermore, the control combination of the first control valve 14, the regulating valve 15, and the second control valve 16 makes maintenance and repair more convenient.

[0040] In this embodiment, both the first control valve 14 and the second control valve 16 are gate valves, and the regulating valve 15 is an electric valve.

[0041] In this embodiment, the first spray assembly 6 includes a first spray pipe 17 and a plurality of first nozzles 18. The first spray pipe 17 is connected to the first branch pipe 12. The first nozzles 18 are disposed on the first spray pipe 17. The plurality of first nozzles 18 are arranged in a ring array or a rectangular array. The arrangement of the first nozzles 18 depends on the structure of the turbine exhaust cylinder 1. When the turbine exhaust cylinder 1 is a circular structure, the plurality of first nozzles 18 are arranged in a ring array. When the turbine exhaust cylinder 1 is a rectangular structure, the plurality of first nozzles 18 are arranged in a rectangular array.

[0042] In this embodiment, the first nozzle 18 is a centrifugal nozzle. The first nozzle 18 is arranged at an angle, and the angle between the spray direction of the first nozzle 18 and the exhaust flow direction is 10° to 20°. The spray angle of the first nozzle 18 is 110° to 120°. The above spraying method can ensure that the spray covers the entire exhaust port area so that the water mist can quickly mix with the exhaust steam near the exhaust port and reduce the exhaust steam temperature to the greatest extent.

[0043] In this embodiment, the second spray assembly 7 includes a second spray pipe 19 and a plurality of second nozzles 20. The second spray pipe 19 is connected to the second branch pipe 13. The second spray pipe 19 has a C-shaped structure. The second nozzles 20 are disposed on the second spray pipe 19. The above structure can maximize the use of space while ensuring the spraying effect, and is convenient for installation and maintenance.

[0044] In this embodiment, the condensate polishing system 4 is connected to a shaft seal heater 21. The shaft seal heater 21 is used to recover the heat of the shaft seal leakage, reduce steam leakage, and prevent air from leaking into the turbine.

[0045] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A spray device for exhaust cylinder of a high-temperature and high-pressure steam turbine, characterized in that: The system includes a steam turbine exhaust cylinder, a condenser, a drainage assembly, a condensate polishing system, a water supply assembly, a first spray assembly, and a second spray assembly. The condenser is connected to the steam turbine exhaust cylinder. The drainage assembly is used to send the condenser outlet water into the condensate polishing system. The water supply assembly is used to send the water treated by the condensate polishing system to the first spray assembly and the second spray assembly. The first spray assembly is located at the exhaust port of the steam turbine exhaust cylinder, and the second spray assembly is located at the bottom of the steam turbine exhaust cylinder.

2. The high-temperature and high-pressure steam turbine exhaust cylinder spraying device according to claim 1, characterized in that: The drainage assembly includes a first condensate pump and a second condensate pump, both of which are located between the condenser and the condensate polishing system.

3. The high-temperature and high-pressure steam turbine exhaust cylinder spraying device according to claim 2, characterized in that: Both the first condensate pump and the second condensate pump are equipped with check valves at their outlets.

4. The high-temperature and high-pressure steam turbine exhaust cylinder spraying device according to claim 1, characterized in that: The water supply assembly includes a water supply pipe, a first branch pipe, and a second branch pipe. The water supply pipe is connected to the condensate polishing system. The first branch pipe is located between the first spray assembly and the condensate polishing system, and the second branch pipe is located between the second spray assembly and the condensate polishing system.

5. The high-temperature and high-pressure steam turbine exhaust cylinder spraying device according to claim 4, characterized in that: Both the first branch pipe and the second branch pipe are equipped with a first control valve, a regulating valve, and a second control valve, with the regulating valve located between the first control valve and the second control valve.

6. The high-temperature and high-pressure steam turbine exhaust cylinder spraying device according to claim 5, characterized in that: Both the first control valve and the second control valve are gate valves, and the regulating valve is an electric valve.

7. The high-temperature and high-pressure steam turbine exhaust cylinder spraying device according to claim 5, characterized in that: The first spray assembly includes a first spray pipe and a plurality of first nozzles. The first spray pipe is connected to the first branch pipe, and the first nozzles are disposed on the first spray pipe. The plurality of first nozzles are arranged in a ring array or a rectangular array.

8. The high-temperature and high-pressure steam turbine exhaust cylinder spraying device according to claim 7, characterized in that: The first nozzle is a centrifugal nozzle, the first nozzle is arranged at an angle, the angle between the spray direction of the first nozzle and the exhaust flow direction is 10° to 20°, and the spray angle of the first nozzle is 110° to 120°.

9. A high-temperature and high-pressure steam turbine exhaust cylinder spraying device according to claim 5, characterized in that: The second spray assembly includes a second spray pipe and a plurality of second nozzles. The second spray pipe is connected to the second branch pipe. The second spray pipe has a C-shaped structure, and the second nozzles are disposed on the second spray pipe.

10. A high-temperature and high-pressure steam turbine exhaust cylinder spraying device according to claim 1, characterized in that: The condensate polishing system is connected to a shaft seal heater.

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