A hydraulic sealing system for a high-temperature and high-pressure water pump
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-19
- Publication Date
- 2026-08-14
AI Technical Summary
同时，由于新能源大力发展，为消纳新能源发电量，因此火电机组不得不参与调峰
[0016]本实用新型的高温高压给水泵水力密封系统有益效果：在实际工作过程中，主机凝汽器输出凝结水输出后，在主机凝泵的作用下分成两路，一路进入第一管路，在第一管路中在至少一个增压泵的作用下实现增压，流向给水泵的密封入口，然后从给水泵的密封出口回流至主机凝汽器的回流口内；另一路进入第二管路，依次通过低压加热器、除氧器、第一前置泵和至少一个中压加热器进入给水泵的给水入口，然后从给水泵的给水出口流出，中压加热器和第一前置泵的存在，使得进入给水泵的给水入口的水温较高，且水压较大，由于第一管路上设置了增压泵，在增压泵的作用下进入密封入口的水压较大，从而实现对给水泵的水力密封。本实用新型的高温高压给水泵水力密封系统，通过在主机凝泵的下游增设至少一个增压泵，在入口压力和温度较大的情况下仍然能够实现稳定地水力密封，提升系统可靠性和安全性。
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Figure CN224634679U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water supply, and in particular to a hydraulic sealing system for a high-temperature and high-pressure water pump. Background Technology
[0002] With the continuous advancement of coal-fired power technology, a high-temperature, high-pressure feedwater pump hydraulic sealing system with a medium-pressure heater has been gradually applied to improve unit economy and reduce investment. This system involves multiple stages of medium-pressure heaters and multiple pre-pumps arranged in series before the feedwater pump. The inlet pressure and temperature of the feedwater pump in this type of unit are significantly higher than those of traditional coal-fired unit feedwater pumps. Simultaneously, due to the vigorous development of new energy sources, coal-fired power units must participate in peak shaving to absorb the generated electricity. During peak shaving, the inlet pressure and temperature changes of the feedwater pump in this type of unit are far greater than those of traditional coal-fired unit feedwater pumps. These operating conditions directly affect the design of the unit's feedwater pump sealing water system.
[0003] Therefore, there is an urgent need to propose a high-temperature and high-pressure feedwater pump hydraulic sealing system that can stably perform hydraulic sealing under operating conditions with large changes in inlet pressure and temperature. Utility Model Content
[0004] The purpose of this invention is to provide a high-temperature and high-pressure water pump hydraulic sealing system. This system can achieve stable hydraulic sealing of the water pump even under high inlet pressure and temperature, thereby improving the reliability and safety of the system.
[0005] To achieve this objective, the present invention adopts the following technical solution:
[0006] This utility model discloses a high-temperature and high-pressure feedwater pump hydraulic sealing system, comprising: a feedwater pump having a feedwater inlet, a feedwater outlet, a sealing inlet, and a sealing outlet, the sealing outlet being connected to the return port of the main condenser; a first pipeline having one end connected to the output port of the main condenser and the other end connected to the sealing inlet, and the first pipeline being sequentially provided with a main condenser pump, a first control valve, and at least one booster pump; and a second pipeline having one end connected to the outlet of the main condenser pump and the other end connected to the feedwater inlet, and the second pipeline being sequentially provided with a low-pressure heater, a deaerator, a first pre-pump, and at least one medium-pressure heater.
[0007] In some embodiments, the high-temperature and high-pressure feedwater pump hydraulic sealing system further includes a third pipeline, one end of which is connected to the outlet of the main condenser and the other end of which is connected to the outlet of the first pre-pump, and a second control valve is provided on the third pipeline.
[0008] In some specific embodiments, the third pipeline is further provided with a first flow regulating valve, a third control valve, and a second flow regulating valve located downstream of the second control valve.
[0009] In some specific embodiments, the high-temperature and high-pressure water pump hydraulic sealing system further includes a fourth pipeline, one end of which is connected to the pump outlet of the main condensate pump, and the other end is connected to a third pipeline. The connection point between the fourth pipeline and the third pipeline is located downstream of the second control valve, and a fourth control valve is provided on the fourth pipeline.
[0010] In some more specific embodiments, the fourth pipeline is further provided with a third flow regulating valve located downstream of the fourth control valve.
[0011] In some embodiments, there are multiple booster pumps.
[0012] In some specific embodiments, each of the booster pumps is provided with a fifth control valve at both ends, and the high-temperature and high-pressure water pump hydraulic sealing system also includes a fifth pipeline connected in parallel with the booster pump, and a bypass control valve is provided on the fifth pipeline.
[0013] In some embodiments, the water outlet of the water pump is provided with a first high-pressure heater and a second high-pressure heater, wherein the heating temperature of the first high-pressure heater is greater than the heating temperature of the second high-pressure heater.
[0014] In some embodiments, there are multiple medium-pressure heaters, and the heating temperature of the multiple medium-pressure heaters increases sequentially along the liquid flow direction.
[0015] In some specific embodiments, the high-temperature and high-pressure water pump hydraulic sealing system further includes a second pre-pump, which is located on the second pipeline. At least one medium-pressure heater is provided between the water inlet and the second pre-pump, and at least two medium-pressure heaters are provided between the second pre-pump and the first pre-pump.
[0016] The beneficial effects of the high-temperature and high-pressure feedwater pump hydraulic sealing system of this utility model are as follows: In actual operation, after the main condenser outputs condensate, it is divided into two paths under the action of the main condenser pump. One path enters the first pipeline, where it is pressurized by at least one booster pump and flows to the sealed inlet of the feedwater pump. Then, it flows back from the sealed outlet of the feedwater pump to the return port of the main condenser. The other path enters the second pipeline, passing sequentially through a low-pressure heater, a deaerator, a first pre-pump, and at least one medium-pressure heater before entering the feedwater inlet of the feedwater pump. Then, it flows out from the feedwater outlet of the feedwater pump. The presence of the medium-pressure heater and the first pre-pump ensures that the water temperature and pressure entering the feedwater inlet of the feedwater pump are relatively high. Because a booster pump is installed on the first pipeline, the water pressure entering the sealed inlet is relatively high under the action of the booster pump, thereby achieving a hydraulic seal for the feedwater pump. The high-temperature and high-pressure water pump hydraulic sealing system of this invention can achieve stable hydraulic sealing even under high inlet pressure and temperature by adding at least one booster pump downstream of the main condensate pump, thereby improving the reliability and safety of the system.
[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the hydraulic sealing system of the high-temperature and high-pressure water pump according to Embodiment 1 of this utility model;
[0019] Figure 2 This is a schematic diagram of the hydraulic sealing system of the high-temperature and high-pressure water pump according to Embodiment 2 of this utility model.
[0020] Figure label:
[0021] 1. Feedwater pump; 2. Main condenser; 3. First pipeline; 4. First control valve; 5. Booster pump; 6. Second pipeline; 7. Low-pressure heater; 8. Deaerator; 9. First pre-pump; 10. Medium-pressure heater; 11. Third pipeline; 12. Second control valve; 13. First flow regulating valve; 14. Third control valve; 15. Second flow regulating valve; 16. Fourth pipeline; 17. Fourth control valve; 18. Third flow regulating valve; 19. Fifth control valve; 20. Fifth pipeline; 21. Bypass control valve; 22. First high-pressure heater; 23. Second high-pressure heater; 24. Second pre-pump; 25. Main condenser pump. Detailed Implementation
[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0023] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, not to indicate or imply that the device or component 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. Furthermore, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0024] Example 1:
[0025] This utility model discloses a hydraulic sealing system for a high-temperature and high-pressure feedwater pump, referenced... Figure 1As shown, the high-temperature and high-pressure feedwater pump hydraulic sealing system includes a feedwater pump 1, a first pipeline 3, and a second pipeline 6. The feedwater pump 1 has a feedwater inlet, a feedwater outlet, a sealing inlet, and a sealing outlet. The sealing outlet is connected to the return port of the main condenser 2. One end of the first pipeline 3 is connected to the output port of the main condenser 2, and the other end is connected to the sealing inlet. The main condenser pump 25, the first control valve 4, and the booster pump 5 are sequentially installed on the first pipeline 3. One end of the second pipeline 6 is connected to the outlet of the main condenser pump 25, and the other end is connected to the feedwater inlet. The second pipeline 6 is sequentially installed with a low-pressure heater 7, a deaerator 8, a first pre-pump 9, and at least one medium-pressure heater 10. Understandably, during actual operation, after the condensate from the main condenser 2 is output, it is divided into two paths by the main condensate pump 25. One path enters the first pipeline 3, where it is boosted by at least one booster pump 5 and flows towards the sealed inlet of the feedwater pump 1. Then, it flows back from the sealed outlet of the feedwater pump 1 to the return port of the main condenser 2. The other path enters the second pipeline 6, passing sequentially through the low-pressure heater 7, deaerator 8, first pre-pump 9, and at least one medium-pressure heater 10 before entering the feedwater inlet of the feedwater pump 1. Then, it flows out from the feedwater outlet of the feedwater pump 1. Due to the presence of the medium-pressure heater 10 and the first pre-pump 9, the water temperature and pressure entering the feedwater inlet of the feedwater pump 1 are relatively high. Since the booster pump 5 is installed on the first pipeline 3, the water pressure entering the sealed inlet is relatively high under the action of the booster pump 5, thereby achieving a hydraulic seal for the feedwater pump 1. The high-temperature and high-pressure feedwater pump hydraulic sealing system of this embodiment can still achieve stable hydraulic sealing under high inlet pressure and temperature by adding at least one booster pump 5 downstream of the main condensate pump 25, thereby improving the reliability and safety of the system.
[0026] refer to Figure 1 As shown, the high-temperature and high-pressure feedwater pump hydraulic sealing system also includes a third pipeline 11. One end of the third pipeline 11 is connected to the outlet of the main condenser 2, and the other end is connected to the outlet of the first pre-pump 9. A second control valve 12 is installed on the third pipeline 11. It is understood that in actual operation, if the feedwater pump 1 stops running, the main condenser 2 will still output liquid to the booster pump 5, which can easily lead to pump stalling and increase the probability of damage to the booster pump 5. In this embodiment, a third pipeline 11 is added, and a second control valve 12 is installed on the third pipeline 11. In actual operation, if the feedwater pump 1 stops running, the second control valve 12 opens, and the liquid output from the main condenser 2 can enter the outlet of the first pre-pump 9 from the third pipeline 11, effectively preventing the booster pump 5 from stalling and improving its service life.
[0027] refer to Figure 1As shown, the third pipeline 11 is also equipped with a first flow regulating valve 13, a third control valve 14, and a second flow regulating valve 15 located downstream of the second control valve 12. It can be understood that by adding the first flow regulating valve 13 and the second flow regulating valve 15, the liquid flow in the third pipeline 11 can be controlled, thereby better controlling the liquid flow to the outlet of the first pre-pump 9, thus ensuring the protection of the booster pump 5.
[0028] refer to Figure 1 As shown, the high-temperature and high-pressure feedwater pump hydraulic sealing system also includes a fourth pipeline 16. One end of the fourth pipeline 16 is connected to the pump outlet of the main condensate pump 25, and the other end is connected to the third pipeline 11. The connection point between the fourth pipeline 16 and the third pipeline 11 is located downstream of the second control valve 12. A fourth control valve 17 is installed on the fourth pipeline 16. It is understood that during actual operation, if the feedwater pump 1 stops running, the fourth control valve 17 opens, allowing the liquid output from the main condensate pump 25 to enter the third pipeline 11 from the fourth pipeline 16 and then flow to the outlet of the first pre-pump 9. This effectively prevents the booster pump 5 from stalling and helps extend its service life.
[0029] refer to Figure 1 As shown, a third flow regulating valve 18 is also provided on the fourth pipeline 16, located downstream of the fourth control valve 17. It can be understood that the added third flow regulating valve 18 can control the liquid flow in the third pipeline 11, thereby better controlling the liquid flow to the outlet of the first pre-pump 9, thus ensuring the protection of the booster pump 5.
[0030] refer to Figure 1 As shown, the water supply outlet of the water pump 1 is equipped with a first high-pressure heater 22 and a second high-pressure heater 23. The heating temperature of the first high-pressure heater 22 is higher than that of the second high-pressure heater 23. Therefore, after the condensate flows out of the water supply outlet of the water pump 1, it is heated by the first high-pressure heater 22 and the second high-pressure heater 23 according to actual needs, which can better meet the user's requirements.
[0031] refer to Figure 1 As shown, there are multiple medium-pressure heaters 10, and the heating temperature of the multiple medium-pressure heaters 10 increases sequentially along the liquid flow direction. Thus, after the condensate flows to the inlet and outlet of the feed water pump 1, it is heated by multiple medium-pressure heaters 10 according to actual needs. With the use of the booster pump 5, a stable hydraulic seal can still be achieved even at high temperatures, ensuring that the high-temperature and high-pressure feed water pump hydraulic seal system can supply water normally.
[0032] refer to Figure 1As shown, the high-temperature and high-pressure feedwater pump hydraulic sealing system also includes a second pre-pump 24, which is located on the second pipeline 6. At least one medium-pressure heater 10 is installed between the feedwater inlet and the second pre-pump 24, and at least two medium-pressure heaters 10 are installed between the second pre-pump 24 and the first pre-pump 9. Thus, after the condensate flows to the feedwater pump 1 and exits through the inlet and outlet, it is transported by the second pre-pump 24. Combined with the use of the booster pump 5, this ensures stable hydraulic sealing even under high pressure, guaranteeing normal water supply from the high-temperature and high-pressure feedwater pump hydraulic sealing system.
[0033] Example 2:
[0034] refer to Figure 2 As shown, the hydraulic sealing system of the high-temperature and high-pressure water pump in this embodiment is basically the same as that in Embodiment 1. The difference is that there are two booster pumps 5 in this embodiment, but they can also be set to three, four or even more depending on the actual situation.
[0035] Optionally, each booster pump 5 is equipped with a fifth control valve 19 at both ends. The high-temperature and high-pressure water pump hydraulic sealing system also includes a fifth pipeline 20 connected in parallel with the booster pump 5, and a bypass control valve 21 is installed on the fifth pipeline 20. It is understood that when it is necessary to repair a booster pump 5, it is only necessary to close the fifth control valve 19 at both ends of the booster pump 5 and then open the bypass control valve 21. This operation is convenient and facilitates the repair and replacement of the booster pump 5.
[0036] It should be further noted that when there is only one booster pump 5, its parameters are low flow rate and high head, which improves the safety of the hydraulic sealing system of the high-temperature and high-pressure water pump. When there are multiple booster pumps 5, their parameters are low flow rate and low head, which reduces the design and manufacturing difficulty of the booster pumps 5 and lowers the manufacturing cost.
[0037] The advantages of the high-temperature and high-pressure water pump hydraulic sealing system disclosed in this utility model are as follows:
[0038] First, given that the pressure at the inlet of the water pump 1 is much higher than that of traditional million-kilowatt units, this system solves the problem of sealing both ends of the water pump 1, which can reduce the difficulty of system design and improve the safety of system operation, thereby ensuring the safe operation of the water pump 1.
[0039] Second: Under the premise of adopting a high-temperature and high-pressure feedwater pump hydraulic sealing system with a multi-stage medium-pressure heater 10, a first pre-pump 9, and a second pre-pump 24, the addition of a third pipeline 11 and a fourth pipeline 16 allows for multiple options for the recirculation loop of the booster pump 5. This ensures the safe operation of the system even if one or more recirculation loops fail. At the same time, the medium pressurized by the booster pump 5 can be recovered to the high-quality system, thereby reducing the pressure loss of this medium and improving the unit's economy.
[0040] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0041] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A high temperature high pressure feed water pump hydraulic seal system, characterized by, include: The feed water pump (1) has a feed water inlet, a feed water outlet, a sealed inlet and a sealed outlet, and the sealed outlet is connected to the return port of the main condenser (2). The first pipeline (3) is connected at one end to the output port of the main condenser (2) and at the other end to the sealed inlet. The first pipeline (3) is provided with a main condenser pump (25), a first control valve (4) and at least one booster pump (5) in sequence. The second pipeline (6) is connected at one end to the outlet of the main condensate pump (25) and at the other end to the water inlet. The second pipeline (6) is provided with a low-pressure heater (7), a deaerator (8), a first pre-pump (9) and at least one medium-pressure heater (10) in sequence.
2. The high temperature high pressure feed water pump hydraulic seal system of claim 1, wherein, It also includes a third pipeline (11), one end of which is connected to the outlet of the main condenser (2) and the other end is connected to the outlet of the first pre-pump (9), and a second control valve (12) is provided on the third pipeline (11).
3. The high temperature high pressure feed water pump hydraulic seal system of claim 2, wherein, The third pipeline (11) is also equipped with a first flow regulating valve (13), a third control valve (14), and a second flow regulating valve (15) located downstream of the second control valve (12).
4. The high temperature high pressure feed water pump hydraulic seal system of claim 2, wherein, It also includes a fourth pipeline (16), one end of which is connected to the pump outlet of the main condensate pump (25), and the other end is connected to the third pipeline (11). The connection between the fourth pipeline (16) and the third pipeline (11) is located downstream of the second control valve (12). A fourth control valve (17) is provided on the fourth pipeline (16).
5. The high temperature high pressure feed water pump hydraulic seal system of claim 4, wherein, The fourth pipeline (16) is also equipped with a third flow regulating valve (18) located downstream of the fourth control valve (17).
6. The high temperature high pressure feedwater pump hydraulic seal system of any one of claims 1-5, wherein, There are multiple booster pumps (5).
7. The high temperature high pressure feed water pump hydraulic seal system of claim 6, wherein, Each of the booster pumps (5) is provided with a fifth control valve (19) at both ends. The high temperature and high pressure water pump hydraulic sealing system also includes a fifth pipeline (20) connected in parallel with the booster pumps (5). A bypass control valve (21) is provided on the fifth pipeline (20).
8. The high temperature high pressure feed water pump hydraulic seal system of any one of claims 1-5, wherein, The water outlet of the water pump (1) is provided with a first high-pressure heater (22) and a second high-pressure heater (23), and the heating temperature of the first high-pressure heater (22) is greater than the heating temperature of the second high-pressure heater (23).
9. The high temperature high pressure feed water pump hydraulic seal system of any one of claims 1-5, wherein, There are multiple medium-pressure heaters (10), and the heating temperature of the multiple medium-pressure heaters (10) increases sequentially along the liquid flow direction.
10. The high temperature high pressure feed water pump hydraulic seal system of claim 9, wherein, It also includes a second pre-pump (24), which is located on the second pipeline (6). At least one medium-pressure heater (10) is provided between the water inlet and the second pre-pump (24), and at least two medium-pressure heaters (10) are provided between the second pre-pump (24) and the first pre-pump (9).