CN219061778U

CN219061778U - Passive drainage system of axial exhaust steam turbine

Info

Publication number: CN219061778U
Application number: CN202320047837.6U
Authority: CN
Inventors: 施海云; 黄娟; 吴振东; 向魁; 石佳
Original assignee: China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
Current assignee: China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
Priority date: 2023-01-06
Filing date: 2023-01-06
Publication date: 2023-05-23
Anticipated expiration: 2033-01-06

Abstract

The utility model relates to the technical field of steam turbines, and discloses an passive drainage system of an axial exhaust steam turbine, which comprises the following components: the drainage pipeline is used for being connected to a drainage point of the steam turbine unit; the drainage expander is connected with the drainage pipeline; the heat well is a sinking heat well and is arranged at the bottom of the condenser, and the heat well is connected with the drainage expansion vessel through a drain pipe; the lowest water level of the drainage point is greater than the water level in the drainage expansion vessel, and the water level in the drainage expansion vessel is greater than the water level in the thermal well, so that drainage of the turbine unit flows into the thermal well through the drainage pipeline and the drainage expansion vessel. According to the utility model, a drainage pump is not required to be arranged on a drain pipe between the drainage expansion vessel and the hot well, so that passive drainage of the axial steam turbine is realized, the drainage reliability of the axial steam turbine is improved, and safe operation of the steam turbine set is ensured.

Description

Passive drainage system of axial exhaust steam turbine

Technical Field

The utility model relates to the technical field of steam turbines, in particular to an passive drainage system of an axial exhaust steam turbine.

Background

When the turbine set operates in the start-stop process and under the variable load working condition, the wall temperature of the steam pipeline and the turbine body is lower than the steam temperature, the steam is cooled when contacting the turbine body and the steam pipeline, when the steam temperature is lower than the saturation temperature corresponding to the steam pressure, the steam is condensed into water, if the condensed water is not discharged in time in the pipe, the pipeline can generate gas-liquid two-phase flow impact, if the condensed water enters the turbine, the moving blade can be damaged by hydraulic impact, so a drainage system is required to be arranged, the water is discharged to a condenser hot well, and the drainage system is critical to the safety of the turbine.

The turbine with axial exhaust is mainly characterized in that exhaust steam after expansion work of the turbine is directly and horizontally exhausted to a condenser along an axial exhaust steam pipeline at the exhaust steam end of a low-pressure cylinder, and the central elevation of the condenser is on the same horizontal line with the central line of the turbine. The water level of the condenser hot well is generally set only by considering the capacity requirement of the hot well, so that the water level of the condenser hot well is generally higher than the water level of the drainage expander. After the steam turbine and the drainage expander of the related steam pipeline are collected, the gravity flow cannot be realized, and the drainage pump is required to be adopted to drain the drainage from the drainage expander to the condenser heat well, so that the method belongs to an active mode. By means of drainage of the pump row, the reliability of the pump is low, and if the pump fails, drainage cannot be performed, so that the steam turbine cannot normally operate.

Disclosure of Invention

The utility model aims to provide an passive drainage system of an axial exhaust steam turbine, which aims to solve the problems that the existing axial exhaust steam turbine is drained by means of a pump, the reliability of the pump is low, and if the pump fails, the turbine is easy to run abnormally.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the passive drainage system of the axial exhaust steam turbine comprises:

the drainage pipeline is used for being connected to a drainage point of the steam turbine unit;

the drainage expander is connected with the drainage pipeline;

the heat well is a sinking heat well and is arranged at the bottom of the condenser, and the heat well is connected with the drainage expansion vessel through a drain pipe;

the lowest water level of the drainage point is greater than the water level in the drainage expansion vessel, and the water level in the drainage expansion vessel is greater than the water level in the thermal well, so that drainage of the turbine unit flows into the thermal well through the drainage pipeline and the drainage expansion vessel.

Preferably, the bottom position of the thermal well is lower than the bottom position of the hydrophobic diffusion vessel.

Preferably, one end of the drain pipe is connected to the bottom of the drain expansion tank, and the other end of the drain pipe is connected to the side wall of the thermal well.

Preferably, the hydrophobic pipeline comprises a hydrophobic main pipe and a plurality of hydrophobic branch pipes, each hydrophobic branch pipe is connected with each hydrophobic point, each hydrophobic branch pipe is connected with the hydrophobic main pipe, and the hydrophobic main pipe is connected with the hydrophobic dilatation device.

Preferably, the hydrophobic manifold is connected to the side wall of the hydrophobic diffusion vessel, and the position of the connection point of the hydrophobic manifold and the hydrophobic diffusion vessel is higher than the water level in the hydrophobic diffusion vessel.

Preferably, the hydrophobic conduit is horizontally disposed.

Preferably, the central axis of the thermal well and the central axis of the hydrophobic diffusion vessel are both vertically arranged.

Compared with the prior art, the passive drainage system of the axial exhaust steam turbine has the beneficial effects that:

the passive drainage system of the axial exhaust steam turbine comprises a drainage pipeline, a drainage expansion vessel and a thermal well, wherein the thermal well adopts a sinking thermal well, and the lowest water level of a drainage point is set to be greater than the water level in the drainage expansion vessel, so that the water level in the drainage expansion vessel is greater than the water level in the thermal well, and drainage of the steam turbine unit flows into the thermal well through the drainage pipeline and the drainage expansion vessel. The drain pipe between the drain expansion vessel and the hot well is not required to be provided with a drain pump, so that the passive drainage of the axial steam turbine is realized, the reliability of drainage of the axial steam turbine is improved, and the safe operation of the steam turbine set is ensured.

Drawings

FIG. 1 is a schematic diagram of an passive drainage system of an axial exhaust turbine according to an embodiment of the present utility model;

in the figure, 1, a hydrophobic pipeline; 11. a hydrophobic manifold; 12. a hydrophobic branch pipe; 2. a hydrophobic diffusion vessel; 3. a hot well; 4. a generator; 5. a high-pressure cylinder; 6. a low pressure cylinder; 7. a condenser.

Detailed Description

In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements 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.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

As shown in fig. 1, an passive drainage system of an axial exhaust steam turbine according to an embodiment of the present utility model is used for draining and collecting condensate of a steam turbine set. The steam turbine unit comprises a generator 4, a high-pressure cylinder 5, a low-pressure cylinder 6 and a condenser 7, the drainage system comprises a drainage pipeline 1, a drainage expansion vessel 2 and a thermal well 3, wherein the drainage pipeline 1 is used for being connected to a drainage point of the steam turbine unit, condensed water of the steam turbine unit is discharged outwards, and the drainage point is specifically arranged at the lower sides of the high-pressure cylinder 5 and the low-pressure cylinder 6; the drainage expander 2 is connected with the drainage pipeline 1, and the drainage expander 2 is used for collecting drainage of the drainage pipeline 1; the heat well 3 is a sinking heat well 3, the heat well 3 is arranged at the bottom of the condenser 7, and the heat well 3 is connected with the drainage expansion vessel 2 through a drain pipe; the lowest water level h1 of the drainage point is higher than the water level h2 in the drainage expansion tank 2, and the water level h2 in the drainage expansion tank 2 is higher than the water level h3 in the thermal well 3, so that drainage of the turbine unit automatically flows into the thermal well 3 through the drainage pipeline 1 and the drainage expansion tank 2.

According to the utility model, a drainage pump is not required to be arranged on a drain pipe between the drainage expansion vessel 2 and the thermal well 3, drainage is not required to depend on the drainage pump, and passive drainage of the axial steam turbine is realized, so that the drainage reliability of the axial steam turbine is improved, and safe operation of the steam turbine set is ensured.

As shown in fig. 1, the bottom position of the thermal well 3 is lower than the bottom position of the drainage expansion vessel 2, so that the water level in the thermal well 3 is lower than the water level of the drainage expansion vessel 2, and smooth drainage self-flowing is ensured. Further, one end of the drain pipe is connected to the bottom of the drain diffusion container 2, the other end of the drain pipe is connected to the side wall of the thermal well 3, and the position of the connection point of the drain pipe and the side wall of the thermal well 3 is lower than the bottom of the drain diffusion container 2.

As shown in fig. 1, the water drain pipe 1 includes a water drain manifold 11 and a plurality of water drain branch pipes 12, wherein each water drain branch pipe 12 is respectively connected with each water drain point and is used for draining water drain at each water drain point; each hydrophobic branch pipe 12 is connected with the hydrophobic main pipe 11, the hydrophobic main pipe 11 is connected with the hydrophobic diffusion container 2, and the hydrophobic main pipe 11 is used for collecting the hydrophobic water of each hydrophobic branch pipe 12 and discharging the hydrophobic water into the hydrophobic diffusion container 2.

Further, the hydrophobic manifold 11 is connected to the side wall of the hydrophobic diffusion container 2, and the connection point of the hydrophobic manifold 11 and the hydrophobic diffusion container 2 is higher than the water level in the hydrophobic diffusion container 2. The hydrophobic manifold 11 is horizontally disposed.

In this embodiment, the water drain pipe 1 is horizontally disposed. The main body of the hydrophobic diffusion vessel is a cylinder, and the main body of the thermal well is a cylinder; the central axis of the thermal well 3 and the central axis of the hydrophobic diffusion vessel 2 are both vertically arranged.

The working process of the utility model is as follows:

according to the minimum water level h1 of the drain point of the axial steam exhaust turbine, the water level h2 of the drain expansion vessel 2 is determined, the water level h3 of the thermal well 3 is linked with the minimum water level h1 of the drain point and the water level h2 of the drain expansion vessel 2, so that h3 is less than h2 and less than h1, condensed water of the high-pressure cylinder 5 and the low-pressure cylinder 6 flows into the drain expansion vessel 2 through the drain pipe 1, and because h3 is less than h2 and less than h1, the condensed water can automatically flow into the thermal well 3 from the drain expansion vessel 2 through the drain pipe without pumping by using a drain pump.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.

Claims

1. An passive drainage system for an axial exhaust steam turbine, comprising:

the drainage expander is connected with the drainage pipeline;

2. The passive drainage system of an axial exhaust steam turbine of claim 1, wherein a bottom position of the thermal well is lower than a bottom position of the drainage diffuser.

3. The passive drainage system of an axial exhaust steam turbine according to claim 2, wherein one end of the drain pipe is connected to the bottom of the drainage diffuser, and the other end of the drain pipe is connected to the side wall of the hot well.

4. The passive drainage system of an axial exhaust steam turbine according to claim 1, wherein the drainage pipeline comprises a drainage manifold and a plurality of drainage branch pipes, each drainage branch pipe is connected with each drainage point, each drainage branch pipe is connected with the drainage manifold, and the drainage manifold is connected with the drainage expander.

5. The passive drainage system of an axial exhaust steam turbine according to claim 4, wherein the drainage manifold is connected to a side wall of the drainage diffuser, and a connection point of the drainage manifold and the drainage diffuser is higher than a water level in the drainage diffuser.

6. The passive drainage system of an axial exhaust steam turbine of claim 1, wherein the drainage conduit is horizontally disposed.

7. The passive drainage system of an axial exhaust steam turbine according to claim 1 or 6, wherein a central axis of the thermal well and a central axis of the drainage diffuser are both vertically arranged.