Multi-stage water seal and automatic drainage cooperation drainage device

Abstract

This utility model relates to the field of steam turbine technology, and more specifically, to a multi-stage water seal and automatic drainage coordinated drainage device. It includes a shaft seal heater, a shaft seal heater drainage regulating valve, a first upper header, a second upper header, a first-stage water seal unit, a second-stage water seal unit, a third-stage water seal unit, a fourth-stage water seal unit, and a steam exhaust device. The shaft seal heater drainage regulating valve is located between the shaft seal heater and the steam exhaust device. The first and second upper headers are connected in series, while the shaft seal heater drainage regulating valve is connected in parallel with the first and second upper headers. The first and second-stage water seal units are located within the first upper header, and the third and fourth-stage water seal units are located within the second upper header. This design optimizes the multi-stage water seal cylinder structure to ensure the safe and stable operation of the shaft seal heater and improves the steam turbine vacuum tightness. This utility model is mainly applied to the coordinated drainage of multi-stage water seals and automatic drainage.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, and more specifically, to a multi-stage water seal and automatic drainage device. Background Technology

[0002] The multi-stage water seal in the shaft seal heater is a key component for maintaining the tightness of the turbine vacuum system. It balances the negative pressure inside the shaft seal heater with atmospheric pressure through multi-stage liquid column pressure, preventing air infiltration. Existing multi-stage water seal devices have the following problems: First-stage inner sleeve water inlet enters from a 40cm horizontal section of the vertical pipe below the upper header. The inlet and outlet positions of the inner and outer sleeves do not match the flow field characteristics, causing vortices to form within the sleeve, entraining air into the downstream stage. This results in large temperature deviations between each stage of the shaft seal cylinder, poor operation of the water seal cylinder, and sudden rises and falls in the shaft seal heater water level. Second, the lack of an independent header: the absence of an independent upper header for zoning and stabilizing the pressure of different stages leads to low inter-stage pressure transmission efficiency, rendering it unqualified. Third, traditional multi-stage water seals often use a single header or upper and lower header structure, resulting in a single water flow path. When the condensate volume suddenly increases, it is prone to untimely drainage, leading to excessively high liquid levels in the shaft seal heater, affecting the stability of equipment operation. The aforementioned problems lead to large vacuum fluctuations and reduced thermal efficiency during unit operation, necessitating optimization of the header layout and water flow path to structurally address disturbance and leakage issues. Utility Model Content

[0003] To overcome the shortcomings of the existing technology, this utility model provides a multi-stage water seal and automatic drainage coordinated drainage device. This solution optimizes the manifold structure and water flow path of the multi-stage water seal, combined with liquid level linkage control, solving the problem of untimely drainage in traditional multi-stage water seals at high liquid levels. This achieves efficient and stable discharge of condensate from the shaft seal heater, improving the safety and economy of equipment operation.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A multi-stage water seal and automatic drainage device includes a shaft seal heater, a shaft seal heater drainage regulating valve, a first upper header, a second upper header, a first-stage water seal unit, a second-stage water seal unit, a third-stage water seal unit, a fourth-stage water seal unit, and a steam exhaust device. The shaft seal heater drain regulating valve is installed between the shaft seal heater and the exhaust device. The first and second upper headers are installed between the shaft seal heater and the exhaust device. The first and second upper headers are connected in series. The shaft seal heater drain regulating valve is connected in parallel with the first and second upper headers. The first and second stage water seal units are installed in the first upper header. The third and fourth stage water seal units are installed in the second upper header. The first, second, third, and fourth stage water seal units are sequentially connected between the shaft seal heater and the exhaust device.

[0005] The pipeline containing the shaft seal heater drain regulating valve is equipped with a front manual valve and a rear manual valve. The front manual valve is located between the shaft seal heater and the shaft seal heater drain regulating valve, and the rear manual valve is located between the shaft seal heater drain regulating valve and the exhaust device.

[0006] The first-stage water seal unit includes a first-stage water seal cylinder, and the second-stage water seal unit includes a second-stage water seal cylinder. Both the first-stage water seal cylinder and the second-stage water seal cylinder are connected to the first upper header.

[0007] The third-stage water seal unit includes a third-stage water seal cylinder, and the fourth-stage water seal unit includes a fourth-stage water seal cylinder. Both the third-stage and fourth-stage water seal cylinders are connected to the second upper header, and the third-stage water seal cylinder is connected to the second-stage water seal cylinder.

[0008] The first-stage water seal cylinder includes an inner sleeve and an outer sleeve. The second-stage water seal cylinder includes an inner sleeve and an outer sleeve. One end of the inner sleeve of the first-stage water seal cylinder is connected to the shaft seal heater, and the other end extends into the outer sleeve. The outer sleeve is connected to the first upper header. One end of the inner sleeve of the second-stage water seal cylinder is connected to the first upper header, and the other end extends into the outer sleeve. The outer sleeve is connected to the third-stage water seal cylinder.

[0009] The third-stage water seal cylinder includes an inner sleeve and an outer sleeve. The fourth-stage water seal cylinder includes an outer sleeve and an inner sleeve. One end of the inner sleeve is connected to the outer sleeve of the second-stage water seal cylinder, and the other end is connected to the outer sleeve. The outer sleeve is connected to the second upper header. One end of the inner sleeve is connected to the second upper header, and the other end is connected to the outer sleeve. The outer sleeve is connected to the exhaust device.

[0010] The inner sleeves of the first-stage water seal cylinder, the second-stage water seal cylinder, the third-stage water seal cylinder, and the fourth-stage water seal cylinder are respectively coaxially arranged with the outer sleeves of the first-stage water seal cylinder, the second-stage water seal cylinder, the third-stage water seal cylinder, and the fourth-stage water seal cylinder.

[0011] The shaft seal heater is equipped with a liquid level detection device, and the shaft seal heater's drain regulating valve is electrically connected to the liquid level detection device.

[0012] When the liquid level detection device detects that the condensate level in the shaft seal heater is lower than 250mm, the condensate drain regulating valve of the shaft seal heater is closed, and the condensate is naturally discharged to the exhaust device through the multi-stage water seal assembly formed by the first stage water seal unit, the second stage water seal unit, the third stage water seal unit, and the fourth stage water seal unit. When the liquid level detection device detects that the condensate level in the shaft seal heater reaches 250mm, the shaft seal heater drain regulating valve will automatically open. The condensate will be discharged directly to the exhaust device through the shaft seal heater drain regulating valve, and drain together with the multi-stage water seal assembly formed by the first stage water seal unit, the second stage water seal unit, the third stage water seal unit, and the fourth stage water seal unit. When the liquid level detection device detects that the condensate level in the shaft seal heater is lower than 250mm, the condensate drain regulating valve of the shaft seal heater will automatically close, and the condensate will resume to be discharged through the multi-stage water seal assembly formed by the first-stage water seal unit, the second-stage water seal unit, the third-stage water seal unit, and the fourth-stage water seal unit.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting a condensate drain regulating valve in parallel with the multi-stage water seal assembly and interlocking it with the liquid level detection device inside the shaft seal heater, efficient coordination of two drainage modes is achieved. When the condensate level is normal, natural drainage relies on the multi-stage water seal; when the liquid level rises to the set value, the regulating valve automatically opens for rapid drainage, effectively preventing excessively high liquid levels in the shaft seal heater from affecting the unit's vacuum, significantly improving the tightness of the condenser vacuum, and ensuring the safety and economy of unit operation. Under normal operating conditions, the device mainly relies on the pressure difference of the multi-stage water seal to achieve gravity flow for natural drainage, greatly reducing the frequency of the condensate drain regulating valve's operation. This not only reduces energy loss caused by frequent valve opening and closing but also effectively reduces mechanical wear on the valves and related actuators, thereby extending the service life of the entire condensate draining device and reducing maintenance costs and operating energy consumption. The multi-stage water seal unit adopts a graded design and innovatively uses a series-connected first and second header, integrating the first and second stage water seals and the third and fourth stage water seals into the two headers respectively. This shared manifold structure greatly simplifies the external piping layout, reduces welds and potential leak points, and makes the system structure more compact and rational. Meanwhile, the coaxial design of the inner and outer sleeves ensures the water seal's effectiveness and the smoothness and stability of the drainage process, improving the overall operational reliability of the system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0015] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0016] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0017] like Figure 1 As shown, a multi-stage water seal and automatic drainage device includes a shaft seal heater 1, a shaft seal heater drainage regulating valve 3, a first upper header 5, a second upper header 6, a first-stage water seal unit, a second-stage water seal unit, a third-stage water seal unit, a fourth-stage water seal unit, and a steam exhaust device 19. The shaft seal heater drain regulating valve 3 is installed between the shaft seal heater 1 and the exhaust device 19. The first upper casing 5 and the second upper casing 6 are installed between the shaft seal heater 1 and the exhaust device 19. The first upper casing 5 and the second upper casing 6 are connected in series. The shaft seal heater drain regulating valve 3 is connected in parallel with the first upper casing 5 and the second upper casing 6. The first-stage water seal unit and the second-stage water seal unit are installed in the first upper casing 5. The third-stage water seal unit and the fourth-stage water seal unit are installed in the second upper casing 6. The first-stage water seal unit, the second-stage water seal unit, the third-stage water seal unit, and the fourth-stage water seal unit are connected sequentially between the shaft seal heater 1 and the exhaust device 19.

[0018] Preferably, the pipeline where the shaft seal heater drain regulating valve 3 is located is equipped with a front manual valve 2 and a rear manual valve 4. The front manual valve 2 is located between the shaft seal heater 1 and the shaft seal heater drain regulating valve 3, and the rear manual valve 4 is located between the shaft seal heater drain regulating valve 3 and the exhaust device 19.

[0019] Preferably, the first-stage water seal unit includes a first-stage water seal cylinder 9, and the second-stage water seal unit includes a second-stage water seal cylinder 10. Both the first-stage water seal cylinder 9 and the second-stage water seal cylinder 10 are connected to the first upper casing 5.

[0020] Preferably, the third-stage water seal unit includes a third-stage water seal cylinder 13, and the fourth-stage water seal unit includes a fourth-stage water seal cylinder 16. Both the third-stage water seal cylinder 13 and the fourth-stage water seal cylinder 16 are connected to the second upper header 6, and the third-stage water seal cylinder 13 is connected to the second-stage water seal cylinder 10.

[0021] Preferably, the first-stage water seal cylinder 9 includes an inner sleeve 7 and an outer sleeve 8, and the second-stage water seal cylinder 10 includes an inner sleeve 11 and an outer sleeve 12. One end of the inner sleeve of the first-stage water seal cylinder is connected to the shaft seal heater 1, and the other end extends into the outer sleeve 8. The outer sleeve 8 is connected to the first upper header 5. One end of the inner sleeve 11 is connected to the first upper header 5, and the other end extends into the outer sleeve 12. The outer sleeve 12 is connected to the third-stage water seal cylinder 13.

[0022] Preferably, the third-stage water seal cylinder 13 includes an inner sleeve 14 and an outer sleeve 15, and the fourth-stage water seal cylinder 16 includes an outer sleeve 17 and an inner sleeve 18. One end of the inner sleeve 14 is connected to the outer sleeve 12 of the second-stage water seal cylinder, and the other end is connected to the outer sleeve 15. The outer sleeve 15 is connected to the second upper header 6. One end of the inner sleeve 18 is connected to the second upper header 6, and the other end is connected to the outer sleeve 17. The outer sleeve 17 is connected to the exhaust device 19.

[0023] Preferably, the inner sleeve 7 of the first-stage water seal cylinder, the inner sleeve 11 of the second-stage water seal cylinder, the inner sleeve 14 of the third-stage water seal cylinder, and the inner sleeve 18 of the fourth-stage water seal cylinder are respectively coaxially arranged with the outer sleeve 8 of the first-stage water seal cylinder, the outer sleeve 12 of the second-stage water seal cylinder, the outer sleeve 15 of the third-stage water seal cylinder, and the outer sleeve 17 of the fourth-stage water seal cylinder.

[0024] Preferably, the shaft seal heater 1 is equipped with a liquid level detection device, and the shaft seal heater drain regulating valve 3 is electrically connected to the liquid level detection device.

[0025] When the liquid level detection device detects that the condensate level in the shaft seal heater is lower than 250mm, the shaft seal heater drain regulating valve 3 is closed, and the condensate is naturally discharged to the exhaust device 19 through the multi-stage water seal assembly formed by the first stage water seal unit, the second stage water seal unit, the third stage water seal unit, and the fourth stage water seal unit. When the liquid level detection device detects that the condensate level in the shaft seal heater 1 reaches 250mm, the shaft seal heater drain regulating valve 3 automatically opens, and the condensate is directly discharged to the exhaust device 19 through the shaft seal heater drain regulating valve 3, and drains together with the multi-stage water seal assembly formed by the first stage water seal unit, the second stage water seal unit, the third stage water seal unit, and the fourth stage water seal unit. When the liquid level detection device detects that the condensate level in the shaft seal heater is lower than 250mm, the condensate drain regulating valve 3 of the shaft seal heater will automatically close, and the condensate will resume to be discharged through the multi-stage water seal assembly formed by the first-stage water seal unit, the second-stage water seal unit, the third-stage water seal unit, and the fourth-stage water seal unit.

[0026] This device reduces welds and potential leakage points, making the system structure more compact and rational. Meanwhile, the coaxial design of the inner and outer sleeves ensures the sealing effect of the water seal and the smoothness and stability of the drainage process, improving the overall operational reliability of the device.

[0027] The above description only details the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model, and all such changes should be included within the protection scope of the present utility model.

Claims

1. A multi-stage water seal and automatic drain cooperative drainage device, characterized in that: It includes a shaft seal heater (1), a shaft seal heater drain regulating valve (3), a first upper header (5), a second upper header (6), a first-stage water seal unit, a second-stage water seal unit, a third-stage water seal unit, a fourth-stage water seal unit, and a steam exhaust device (19). The shaft seal heater drain regulating valve (3) is provided between the shaft seal heater (1) and the exhaust device (19). The first upper junction box (5) and the second upper junction box (6) are provided between the shaft seal heater (1) and the exhaust device (19). The first upper junction box (5) and the second upper junction box (6) are connected in series. The shaft seal heater drain regulating valve (3) is connected in parallel with the first upper junction box (5) and the second upper junction box (6). The first-stage water seal unit and the second-stage water seal unit are provided in the first upper junction box (5). The third-stage water seal unit and the fourth-stage water seal unit are provided in the second upper junction box (6). The first-stage water seal unit, the second-stage water seal unit, the third-stage water seal unit, and the fourth-stage water seal unit are sequentially connected between the shaft seal heater (1) and the exhaust device (19).

2. The multi-stage water seal and automatic drainage device according to claim 1, characterized in that: The pipeline where the shaft seal heater drain regulating valve (3) is located is equipped with a front manual valve (2) and a rear manual valve (4). The front manual valve (2) is located between the shaft seal heater (1) and the shaft seal heater drain regulating valve (3). The rear manual valve (4) is located between the shaft seal heater drain regulating valve (3) and the exhaust device (19).

3. The multi-stage water seal and automatic drainage device according to claim 1, characterized in that: The first-stage water seal unit includes a first-stage water seal cylinder (9), and the second-stage water seal unit includes a second-stage water seal cylinder (10). Both the first-stage water seal cylinder (9) and the second-stage water seal cylinder (10) are connected to the first upper header (5).

4. The multi-stage water seal and automatic drainage device according to claim 3, characterized in that: The third-stage water seal unit includes a third-stage water seal cylinder (13), and the fourth-stage water seal unit includes a fourth-stage water seal cylinder (16). Both the third-stage water seal cylinder (13) and the fourth-stage water seal cylinder (16) are connected to the second upper header (6). The third-stage water seal cylinder (13) is connected to the second-stage water seal cylinder (10).

5. The multi-stage water seal and automatic drainage device according to claim 4, characterized in that: The first-stage water seal cylinder (9) includes a first-stage water seal cylinder inner sleeve (7) and a first-stage water seal cylinder outer sleeve (8). The second-stage water seal cylinder (10) includes a second-stage water seal cylinder inner sleeve (11) and a second-stage water seal cylinder outer sleeve (12). One end of the first-stage water seal cylinder inner sleeve (7) is connected to the shaft seal heater (1), and the other end extends into the first-stage water seal cylinder outer sleeve (8). The first-stage water seal cylinder outer sleeve (8) is connected to the first upper header (5). One end of the second-stage water seal cylinder inner sleeve (11) is connected to the first upper header (5), and the other end extends into the second-stage water seal cylinder outer sleeve (12). The second-stage water seal cylinder outer sleeve (12) is connected to the third-stage water seal cylinder (13).

6. The multi-stage water seal and automatic drainage device according to claim 5, characterized in that: The third-stage water seal cylinder (13) includes an inner sleeve (14) and an outer sleeve (15). The fourth-stage water seal cylinder (16) includes an outer sleeve (17) and an inner sleeve (18). One end of the inner sleeve (14) is connected to the outer sleeve (12) of the second-stage water seal cylinder, and the other end is connected to the outer sleeve (15). The outer sleeve (15) is connected to the second upper header (6). One end of the inner sleeve (18) is connected to the second upper header (6), and the other end is connected to the outer sleeve (17). The outer sleeve (17) is connected to the exhaust device (19).

7. The multi-stage water seal and automatic drainage device according to claim 6, characterized in that: The inner sleeve (7) of the first-stage water seal cylinder, the inner sleeve (11) of the second-stage water seal cylinder, the inner sleeve (14) of the third-stage water seal cylinder, and the inner sleeve (18) of the fourth-stage water seal cylinder are respectively coaxially arranged with the outer sleeve (8) of the first-stage water seal cylinder, the outer sleeve (12) of the second-stage water seal cylinder, the outer sleeve (15) of the third-stage water seal cylinder, and the outer sleeve (17) of the fourth-stage water seal cylinder.

8. The multi-stage water seal and automatic drainage device according to claim 1, characterized in that: The shaft seal heater (1) is equipped with a liquid level detection device, and the shaft seal heater drain regulating valve (3) is electrically connected to the liquid level detection device.

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