CN221400675U - Drainage system of shaft seal heater - Google Patents

Abstract

The utility model relates to the technical field of shaft seal heaters, and discloses a shaft seal heater drainage system, which comprises a normal drainage pipeline and an accident drainage pipeline, wherein the normal drainage pipeline is connected between a shaft seal heater body and a water seal assembly; the accident drainage pipeline is connected between the shaft seal heater body and the condenser; the liquid level device can measure water level data of the shaft seal heater body, the flow control valve is arranged on the normal drainage pipeline, the controller is used for regulating and controlling the opening of the flow control valve according to the water level data so as to maintain the water level of the shaft seal heater body, the electric control valve is arranged on the accident drainage pipeline, and the liquid level device is used for automatically opening the electric control valve when the water level data exceeds a second set value. When maintaining stable water level in the bearing seal heater body, bearing seal steam and condensate water fully exchange heat, and the thermal efficiency of unit is higher, and the condenser can be maintained and is operated in high vacuum state simultaneously, and the security is better.

Description

Drainage system of shaft seal heater

Technical Field

The utility model relates to the technical field of shaft seal heaters, in particular to a water drainage system of a shaft seal heater.

Background

The shaft seal heater is an important heat exchange device in a shaft seal system of a steam turbine, and has the functions of heating condensation water by utilizing the return steam of the shaft seal and the leakage steam of a valve rod, reducing heat loss and improving the heat efficiency of a unit. The shaft seal return steam after heat exchange with the condensation water is condensed into drainage water, and then the drainage water is recovered to the condenser through a multi-stage water seal, so that the working medium loss is reduced. The multistage water seal is used for increasing the flow resistance of the drain water to the condenser so as to maintain a certain water level in the shaft seal heater and further maintain the vacuum in the condenser.

In the actual operation process of the shaft seal heater, the condition that water does not exist in the shaft seal heater can occur, the returned gas of the shaft seal cannot fully exchange heat with condensed water, and the returned gas directly enters the water seal to be condensed, so that energy loss is caused, and the thermal efficiency of the unit is reduced.

Disclosure of utility model

The present utility model has been made based on the findings and knowledge of the inventors regarding the following facts and problems:

In theory, when the height difference of the flow resistance and the drain water generated by the multi-stage water seal is equal to the vacuum of the condenser, the drain water in the shaft seal heater body is in a balanced state, and the stable water level can be maintained in the shaft seal heater body. However, in practice, the vacuum degree in the condenser is affected by various factors such as seasons, when the vacuum degree is higher, water in the shaft seal heater body is easy to be left, and further the shaft seal return steam cannot exchange heat with condensed water sufficiently, so that the thermal efficiency of the unit is reduced.

The present utility model aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the utility model provides a shaft seal heater drainage system, which can automatically adjust the water level in the shaft seal heater body, so that the stable water level is maintained in the shaft seal heater body, further, heat exchange between the shaft seal return steam and condensed water is more sufficient, and the thermal efficiency of a unit is improved.

The shaft seal heater drainage system comprises a shaft seal heater body, a normal drainage pipeline and an accident drainage pipeline, wherein the normal drainage pipeline is connected between the shaft seal heater body and a water seal assembly; the accident drainage pipeline is connected between the shaft seal heater body and the condenser; the shaft seal heater drainage system further comprises a control unit, the control unit comprises a liquid level device, a flow control valve, an electric control valve and a controller, the liquid level device can measure water level data of the shaft seal heater body, the flow control valve is arranged on the normal drainage pipeline, the controller is used for regulating and controlling the opening of the flow control valve according to the water level data so that the water level of the shaft seal heater body is maintained at a first set value, the electric control valve is arranged on the accident drainage pipeline, and the liquid level device is used for opening the electric control valve when the water level data exceeds a second set value.

In the water drainage system of the shaft seal heater, the liquid level device can measure water level data in the shaft seal heater body, the controller can adjust the opening of the flow control valve to increase the drainage speed of the shaft seal heater body when the water level is higher than a first set value, and the controller can adjust the opening of the flow control valve to reduce the drainage speed of the shaft seal heater body when the water level is lower than the first set value, so that the stable water level is maintained in the shaft seal heater body finally.

When maintaining comparatively stable water level in the bearing seal heater body, the bearing seal return steam can not directly get into the condenser through the water seal subassembly, but in the bearing seal heater body with the abundant heat transfer of condensate water, improved the thermal efficiency of unit. In addition, the shaft seal heater maintains comparatively stable water level in the body and can also make the condenser maintain the operation in high vacuum state, and the security is better.

When the water level data exceeds a second set value, the electric control valve can be automatically opened, water in the shaft seal heater body is timely discharged to the condenser through the accident drainage pipeline, and the phenomenon that the shaft seal return steam is not smooth due to the fact that the shaft seal return steam inlet is submerged due to the fact that the water level is too high is avoided.

In some embodiments, the liquid level device comprises a liquid level sensor and a liquid level switch, wherein the liquid level sensor is used for measuring the water level data, and the liquid level switch is connected with the electric control valve and used for controlling the opening and closing of the electric control valve.

In some embodiments, the normal drainage pipeline comprises a normal drainage main pipeline and a normal drainage bypass pipeline, a first valve is arranged on the normal drainage main pipeline and used for controlling on-off of the normal drainage main pipeline, and the flow control valve is arranged on the normal drainage bypass pipeline.

In some embodiments, the normally hydrophobic bypass is further provided with a second valve, and the second valve is located on a side of the flow control valve adjacent to the shaft seal heater body.

In some embodiments, the first valve is a manual control valve and/or the second valve is a manual control valve.

In some embodiments, the water seal assembly comprises a plurality of water seal cartridges, a plurality of the water seal cartridges being connected in series.

In some embodiments, the water seal cylinder comprises a conduction block, the conduction block is arranged in the water seal cylinder, and a curved runner is arranged in the conduction block.

In some embodiments, the water seal cartridge includes a first filter disposed at an inlet of the curved flow passage and a second filter disposed at an outlet of the curved flow passage.

In some embodiments, the shaft seal heater drain system includes a third valve disposed between the water seal assembly and the condenser, and the third valve is a manual control valve.

In some embodiments, the shaft seal heater drainage system comprises a temperature measurement unit comprising a first temperature measurement member and a second temperature measurement member, wherein the first temperature measurement member is arranged on the steam exhaust pipeline and is used for measuring the steam exhaust temperature of the shaft seal heater body, and the second temperature measurement member is arranged on the normal drainage pipeline and is used for measuring the drainage temperature of the shaft seal heater body.

Drawings

FIG. 1 is a schematic diagram of the configuration of a shaft seal heater drain system according to an embodiment of the present utility model.

FIG. 2 is a schematic diagram of a control unit of a shaft seal heater drain system according to an embodiment of the present utility model.

Fig. 3 is a schematic structural view of a water seal assembly of a hydrophobic system of a shaft seal heater according to an embodiment of the present utility model.

Reference numerals:

1. A shaft seal heater body; 2. a water seal assembly; 21. a first water seal cylinder; 211. a water inlet; 212. a water outlet; 213. a conduction block; 2131. a curved flow path; 214. a mounting block; 215. a first filter; 216. a second filter; 217. a first support block; 218. a second support block; 22. a second water seal cylinder; 23. a third water seal cylinder; 24. a fourth water seal cylinder; 3. a condenser; 4. a normal drainage pipeline; 41. a normal hydrophobic main path; 411. a first valve; 42. a normal hydrophobic bypass; 421. a second valve; 5. an accident drainage pipeline; 6. a control unit; 61. a liquid level device; 62. a flow control valve; 63. an electric control valve; 64. a controller; 7. a third valve; 8. a temperature measuring unit; 81. a first temperature measuring member; 82. and the second temperature measuring piece.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

As shown in fig. 1 and 2, the shaft seal heater drainage system in the embodiment of the utility model comprises a shaft seal heater body 1, a normal drainage pipeline 4 and an accident drainage pipeline 5, wherein the normal drainage pipeline 4 is connected between the shaft seal heater body 1 and the water seal assembly 2, and the accident drainage pipeline 5 is connected between the shaft seal heater body 1 and the condenser 3.

The shaft seal heater drainage system further comprises a control unit 6, the control unit 6 comprises a liquid level device 61, a flow control valve 62, an electric control valve 63 and a controller 64, the liquid level device 61 can measure water level data of the shaft seal heater body 1, the flow control valve 62 is arranged on the normal drainage pipeline 4, the controller 64 is used for regulating and controlling the opening degree of the flow control valve 62 according to the water level data so that the water level of the shaft seal heater body 1 is maintained at a first set value, the electric control valve 63 is arranged on the accident drainage pipeline 5, and the liquid level device 61 is used for automatically opening the electric control valve 63 when the water level data exceeds a second set value.

It can be understood that the water in the shaft seal heater body 1 flows to the water seal assembly 2 through the normal water drain pipeline 4, and then enters the condenser 3 through the water seal assembly 2. When the water level in the shaft seal heater body 1 is too high, the condensed water can also directly flow to the condenser 3 through the accident drainage pipeline 5.

The liquid level device 61 is used for automatically opening the electric control valve 63 when the water level data exceeds the second set value, and it can be understood that a liquid level switch is arranged inside the liquid level device 61, the liquid level switch has a high liquid level H value and a low liquid level L value, and when the water level data exceeds the H value, the liquid level device 61 controls the electric control valve 63 to be opened, and water in the shaft seal heater body 1 is timely discharged to the condenser 3 through the accident drainage pipeline 5. When the water level data falls back to the L value, the liquid level device 61 controls the electric control valve 63 to be closed.

In the water drainage system of the shaft seal heater, the liquid level device can measure water level data in the shaft seal heater body, the controller can adjust the opening of the flow control valve to increase the drainage speed of the shaft seal heater body when the water level is higher than a first set value, and the controller can adjust the opening of the flow control valve to reduce the drainage speed of the shaft seal heater body when the water level is lower than the first set value, so that the stable water level is maintained in the shaft seal heater body finally.

When maintaining comparatively stable water level in the bearing seal heater body, the bearing seal return steam can not directly get into the condenser through the water seal subassembly, but in the bearing seal heater body with the abundant heat transfer of condensate water, improved the thermal efficiency of unit. In addition, the shaft seal heater maintains comparatively stable water level in the body and can also make the condenser maintain the operation in high vacuum state, and the security is better.

When the water level data exceeds a second set value, the electric control valve can be opened to conduct the accident drainage pipeline to timely drain water in the shaft seal heater body, so that the phenomenon that the shaft seal return steam is unsmooth and even enters the bearing box due to the fact that the water level is too high submerges the shaft seal return steam inlet is avoided.

Alternatively, as shown in fig. 1 and 2, the liquid level device 61 includes a liquid level sensor for measuring water level data and a liquid level switch connected to the electric control valve 63 and for controlling the opening and closing of the electric control valve 63.

The level sensor senses real-time water level data and the controller 64 can regulate the opening of the flow control valve 62 in real-time according to the water level data so that the water level is maintained near the first set value. The liquid level switch has high liquid level H value and low liquid level L value, and when normal drain pipeline 4 breaks down or other reasons lead to liquid level in the shaft seal heater body 1 to surpass H value, the liquid level switch can control electric control valve 63 to open, in time discharges the water in the shaft seal heater body 1 to condenser 3 through accident drain pipeline 5.

Alternatively, as shown in fig. 1 and 2, the normal drainage pipeline 4 includes a normal drainage main path 41 and a normal drainage bypass path 42, the normal drainage main path 41 is provided with a first valve 411, the first valve 411 is used for controlling on-off of the normal drainage main path 41, and the flow control valve 62 is disposed in the normal drainage bypass path 42.

When the shaft seal heater body 1 is normally operated, the first valve 411 is closed, the normal drain main passage 41 is blocked, and drain is discharged through the normal drain bypass 42. When the normal drain bypass 42 fails or requires maintenance, the first valve 411 may be opened to temporarily drain the drain through the normal drain main 41.

Optionally, as shown in fig. 1 and 2, the normal drain bypass 42 is further provided with a second valve 421, and the second valve 421 is located on the side of the flow control valve 62 close to the shaft seal heater body 1. Providing the second valve 421 facilitates maintenance and repair of the flow control valve 62.

Alternatively, the first valve 411 is a manual control valve and the second valve 421 is a manual control valve. When maintenance is needed, the first valve 411 or the second valve 421 can be opened and closed manually, which is convenient.

In some embodiments, as shown in fig. 3, the water seal assembly 2 includes a plurality of water seal cartridges connected in series.

For example, the water seal cylinders are provided with four, namely, a first water seal cylinder 21, a second water seal cylinder 22, a third water seal cylinder 23, and a fourth water seal cylinder 24. Each water sealed cylinder comprises a water inlet 211 and a water outlet 212. The water inlet 211 of the first water seal cylinder 21 is positioned at the upper part, and the water outlet 212 is positioned at the lower part; the water inlet 211 of the second water seal cartridge 22 is located at the lower portion, and the water outlet 212 is located at the upper portion. The four water seal cylinders are connected in series, the arrangement can increase the hydrophobic flow resistance, and the shaft seal heater body 1 is not easy to generate the conditions of too low water level and even no water. In addition, the condenser 3 can be maintained to operate in a high vacuum state due to the large flow resistance, so that the safety benefit is good.

Optionally, as shown in fig. 3, the water seal cylinder includes a conducting block 213, the conducting block 213 is disposed in the water seal cylinder, and a curved flow channel 2131 is disposed in the conducting block 213.

For example, the conducting block 213 is located in the middle of the water seal cylinder and is fixed by the mounting block 214, the inlet of the curved runner 2131 is communicated with the water inlet 211 of the water seal cylinder, and the outlet of the curved runner 2131 is communicated with the water outlet 212 of the water seal cylinder. The curved flow passage 2131 has longer flow path and larger flow resistance, is beneficial to the operation of the condenser 3 in a high vacuum state, and has better safety benefit.

Alternatively, as shown in fig. 3, the water seal cartridge includes a first filter 215 and a second filter 216, the first filter 215 is disposed at an inlet of the curved flow path 2131, and the second filter 216 is disposed at an outlet of the curved flow path 2131.

For example, the first filter 215 and the second filter 216 may be a multi-layered gauze. The first filter 215 is installed in the water-sealed cylinder through the first supporting block 217, and the second filter 216 is installed in the water-sealed cylinder through the second supporting block 218. The first filter 215 and the second filter 216 are arranged to filter and intercept bubbles in the water.

In some embodiments, as shown in fig. 1, the shaft seal heater drain system includes a third valve 7, the third valve 7 being disposed between the water seal assembly 2 and the condenser 3. When the water seal assembly 2 needs to be maintained, the third valve 7, the first valve 411 and the second valve 421 can be closed to isolate the water seal assembly 2, and then the electric control valve 63 is opened to drain water by adopting the accident drain pipeline 5. In particular, the third valve 7 may be a manual control valve.

In some embodiments, as shown in fig. 1, the shaft seal heater drainage system comprises a temperature measuring unit 8, the temperature measuring unit 8 comprises a first temperature measuring piece 81 and a second temperature measuring piece 82, the first temperature measuring piece 81 is used for measuring the steam exhaust temperature of the shaft seal heater body 1, and the second temperature measuring piece 82 is used for measuring the drainage temperature of the shaft seal heater body 1.

For example, a first temperature measuring member 81 is provided on the exhaust steam pipe, and a second temperature measuring member 82 is provided on the normally drain pipe 4. The heat exchange effect of the shaft seal return steam and the condensed water in the shaft seal heater body 1 can be judged by the temperature difference obtained by the measurement of the temperature measuring unit 8.

After the shaft seal heater drainage system provided by the embodiment of the utility model is adopted in a power plant, the water level in the shaft seal heater body 1 is kept stable, the drainage temperature measured by the second temperature measuring piece 82 is reduced to 35 ℃ from the original 80 ℃, the steam exhaust temperature measured by the first temperature measuring piece 81 is reduced by 6 ℃, and the temperature difference between a condensation water inlet and a condensation water outlet is increased by 0.17 ℃. Therefore, the heat exchange of the shaft seal return steam and the condensed water in the shaft seal heater body 1 is more sufficient, the temperature of the condensed water is higher, and the heat efficiency of the unit is improved. In addition, the water level in the shaft seal heater body 1 is stable, normal operation of the condenser 3 in a high vacuum state is guaranteed, and safety benefit is improved.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. The shaft seal heater drainage system is characterized by comprising a shaft seal heater body, a normal drainage pipeline and an accident drainage pipeline, wherein the normal drainage pipeline is connected between the shaft seal heater body and a water seal assembly; the accident drainage pipeline is connected between the shaft seal heater body and the condenser; the shaft seal heater drainage system further comprises a control unit, the control unit comprises a liquid level device, a flow control valve, an electric control valve and a controller, the liquid level device can measure water level data of the shaft seal heater body, the flow control valve is arranged on the normal drainage pipeline, the controller is used for regulating and controlling the opening of the flow control valve according to the water level data so that the water level of the shaft seal heater body is maintained at a first set value, the electric control valve is arranged on the accident drainage pipeline, and the liquid level device is used for opening the electric control valve when the water level data exceeds a second set value.

2. The drain system of claim 1, wherein the fluid level device comprises a fluid level sensor for measuring the water level data and a fluid level switch connected to the electrically controlled valve for controlling the opening and closing of the electrically controlled valve.

3. The shaft seal heater drain system of claim 2 wherein said normally drain line includes a normally drain main line and a normally drain bypass, said normally drain main line being provided with a first valve and said first valve being for controlling on-off of said normally drain main line, said flow control valve being disposed in said normally drain bypass.

4. The shaft seal heater drain system of claim 3 wherein said normal drain bypass is further provided with a second valve and said second valve is located on a side of said flow control valve adjacent said shaft seal heater body.

5. The shaft seal heater drain system of claim 4 wherein said first valve is a manual control valve and/or said second valve is a manual control valve.

6. The shaft seal heater drain system of claim 1 wherein said water seal assembly comprises a plurality of water seal cartridges, a plurality of said water seal cartridges being connected in series.

7. The shaft seal heater drain system of claim 6 wherein said water seal cartridge includes a pass-through block disposed within said water seal cartridge, said pass-through block having a curved flow passage disposed therein.

8. The shaft seal heater drain system of claim 7 wherein said water seal cartridge comprises a first filter disposed at an inlet of said curved flow passage and a second filter disposed at an outlet of said curved flow passage.

9. The shaft seal heater drain system of claim 1, comprising a third valve disposed between the water seal assembly and the condenser, and the third valve is a manual control valve.

10. The shaft seal heater drainage system of any of claims 1-9, comprising a temperature measurement unit comprising a first temperature measurement member disposed in a steam exhaust conduit for measuring a steam exhaust temperature of the shaft seal heater body and a second temperature measurement member disposed in the normal drainage conduit for measuring a drainage temperature of the shaft seal heater body.