CN214403692U

CN214403692U - Low-position arranged drainage system of gas turbine

Info

Publication number: CN214403692U
Application number: CN202023151470.8U
Authority: CN
Inventors: 黄磊; 季勇; 陈蔡辉; 王信海; 薛晓丹; 陈育森; 迟欣; 陈宇
Original assignee: Huaneng Nantong Gas Turbine Power Generation Co ltd; China Energy Engineering Group Jiangsu Power Design Institute Co Ltd
Current assignee: Huaneng Nantong Gas Turbine Power Generation Co ltd; China Energy Engineering Group Jiangsu Power Design Institute Co Ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-10-15
Anticipated expiration: 2030-12-24

Abstract

The utility model discloses a low-position arrangement gas turbine drainage system, which comprises a primary drainage collector and a secondary drainage collector; the first-stage drainage collector is communicated with the second-stage drainage collector through a connecting pipeline, and a check valve A and a pneumatic drain valve are arranged on the connecting pipeline; the secondary drainage collector is connected with an auxiliary steam source through a steam supply pipeline, and a check valve B, a single-stage throttle rod, a pneumatic auxiliary steam valve and an electric auxiliary steam valve are arranged on the steam supply pipeline; the second-stage drainage collector is connected to a drainage vertical pipe through a drainage pipeline, and a stop valve A and a pneumatic drainage valve are arranged on the drainage pipeline. The drainage system provided by the utility model has simple equipment structure, only adds an auxiliary steam source and a drainage collector, and has convenient equipment modification, small investment and low operation cost; the auxiliary steam is added to supply a steam pipeline, so that drainage is timely discharged to a drainage vertical pipe of the drainage flash tank, the problem of unsmooth drainage is solved, and the safe operation of the unit is guaranteed.

Description

Low-position arranged drainage system of gas turbine

Technical Field

The utility model relates to a low level arranges combustion engine drainage system belongs to the hydrophobic technical field of combustion engine.

Background

In a steam pipeline system, in order to ensure that condensed water in a steam turbine body and a pipeline thereof is discharged when a unit is started, stopped, and operated at a low load or under an abnormal condition, thereby preventing serious accidents such as bending of a steam turbine rotor and damage to internal parts caused by turbine water passing, a drainage system is generally arranged on the pipeline.

The range of the drainage system comprises drainage of a steam turbine body and drainage of a steam turbine body pipeline, namely drainage of a main steam valve and a pipeline between the main steam valve and the steam turbine body, drainage of each steam extraction check valve and a pipeline between the steam extraction check valve and a cylinder, drainage of a high-pressure cylinder steam exhaust check valve and a pipeline between the high-pressure steam exhaust port, and drainage of a steam supply main pipe and a steam supply branch pipe behind an auxiliary steam source control station and an overflow control station of the self-sealing steam seal system.

The drain branch pipe is provided with a pneumatic drain valve and a manual stop valve, and the drain is connected to a drain vertical pipe of a steam condenser backpack type drain flash tank. However, in the installation process, if the steam turbine is arranged at a low position, the steam exhaust mode is axial steam exhaust, and the height of a drainage point in front of a steam exhaust check valve of the high-pressure cylinder is lower than the height of a drainage vertical pipe connected with the steam exhaust check valve. Before the steam turbine is flushed and stopped, as the vacuum state of the drainage vertical pipe cannot be completely established, drainage cannot be automatically drained to the drainage vertical pipe, and meanwhile, automatic drainage cannot be carried out through high potential difference, so that drainage cannot be timely drained. Therefore, the existing drainage mode can cause the problem that the drainage in front of the high-pressure cylinder exhaust check valve is not smooth.

SUMMERY OF THE UTILITY MODEL

The purpose is as follows: in order to overcome the defects existing in the prior art, the utility model provides a low-level arrangement type drainage system of a combustion engine.

The technical scheme is as follows: in order to solve the technical problem, the utility model discloses a technical scheme does:

a low-position arrangement gas turbine drainage system comprises a primary drainage collector and a secondary drainage collector;

the first water outlet of the first-stage hydrophobic collector is communicated with the first water inlet of the second-stage hydrophobic collector through a connecting pipeline, and a pneumatic drain valve is arranged on the connecting pipeline;

a second steam inlet of the secondary drainage collector is connected with an auxiliary steam source through a steam supply pipeline, and a pneumatic auxiliary steam valve and an electric auxiliary steam valve are arranged on the steam supply pipeline;

the water outlet of the secondary drainage collector is connected to a drainage vertical pipe through a drainage pipeline, and a stop valve A and a pneumatic drainage valve are arranged on the drainage pipeline.

Further, a liquid level meter is arranged on the secondary hydrophobic collector and used for detecting and displaying the water level condition in the secondary hydrophobic collector.

Furthermore, a second water outlet of the primary hydrophobic collector is connected with a water drain pipeline, and a stop valve B is arranged on the water drain pipeline.

Furthermore, a water outlet of the secondary drainage collector is connected with a water drainage pipeline, and a stop valve B is arranged on the water drainage pipeline.

Furthermore, a single-stage throttle rod and a check valve B are also arranged on the steam supply pipeline.

Further, a check valve A is arranged on the connecting pipeline.

Has the advantages that: the utility model provides a low-level arrangement gas turbine drainage system, the equipment structure is simple, only an auxiliary steam source and a drainage collector are added, the equipment transformation is convenient, the investment is small, and the operation cost is low; this system supplies the vapour pipeline through increasing supplementary steam, in time arranges the hydrophobic riser of hydrophobic flash vessel with hydrophobic, solves the problem that drainage is not smooth, has guaranteed the safe operation of unit.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The labels in the figure are: 1. the system comprises a first-stage drainage collector, a second-stage drainage collector, a check valve A, a pneumatic drain valve 4, a stop valve A, a pneumatic drainage valve 6, an electric auxiliary steam valve 7, a check valve B8, a single-stage throttle rod 9, a pneumatic auxiliary steam valve 10, a stop valve B11, a liquid level meter 12, a connecting pipeline 13, a drainage pipeline 14, a steam supply pipeline 15 and a drainage pipeline 16.

Detailed Description

The present invention will be further described with reference to the accompanying drawings. The terms "first," "second," and the like are used merely to aid in describing the structure of the same or similar devices, and are not intended to be used primarily or sequentially.

A drainage system of a low-position arranged combustion engine is shown in figure 1 and comprises a primary drainage collector 1 and a secondary drainage collector 2. The pipeline of connecting steam turbine interface and high row check valve is for taking the slope pipeline, and the pipeline lowest position is connected with the upper end water inlet of one-level hydrophobic collector 1, communicates through connecting tube 13 between the first delivery port of one-level hydrophobic collector 1 and the first water inlet of second grade hydrophobic collector 2, is equipped with check valve A3, pneumatic drain valve 4 on the connecting tube 13. The secondary hydrophobic collector 2 is provided with a liquid level meter 12 for detecting and displaying the water level condition in the secondary hydrophobic collector 2.

The second steam inlet of the second-stage hydrophobic collector 2 is connected with an auxiliary steam source through a steam supply pipeline 15, and a pneumatic auxiliary steam valve 10, a single-stage throttle rod 9, a check valve B8 and an electric auxiliary steam valve 7 are arranged on the steam supply pipeline 15. The water outlet of the secondary drainage collector 2 is connected to a drainage vertical pipe through a drainage pipeline 14, and a stop valve A5 and a pneumatic drainage valve 6 are arranged on the drainage pipeline 14.

The second water outlet of the first-stage hydrophobic collector 1 and the water outlet of the second-stage hydrophobic collector 2 are respectively connected with a water discharge pipeline 16, and a stop valve B11 is arranged on the water discharge pipeline 16. According to experience, a three-way pipe can be arranged at the water outlet of the secondary drainage collector 2, one pipe orifice of the three-way pipe is connected with the water outlet of the secondary drainage collector 2, and the other two pipe orifices are connected with the water drainage pipeline 16 and the drainage pipeline 14.

When the steam turbine is in a normal operation state, the steam turbine adopts conventional logic drainage, the electric auxiliary steam valve 7 and the pneumatic auxiliary steam valve 10 on the steam supply pipeline 15 are in a closed state, the stop valves B11 on the water discharge pipelines 16 of the first-stage drainage collector 1 and the second-stage drainage collector 2 are in a closed state, the pneumatic drainage valve 6 on the drainage pipeline 14 of the second-stage drainage collector is in a closed state, and other pipe fittings are in an open state. When the liquid level meter 12 on the secondary drainage collector 2 indicates that the water level reaches a limit value, the pneumatic drainage valve 6 on the drainage pipeline 14 is automatically opened, drainage is drained to a drainage vertical pipe, and conventional logic drainage is completed.

When the steam turbine is before the impulse rotation and after the shutdown, the conventional logic drainage is adopted, and drainage cannot be normally discharged into a drainage vertical pipe which is not completely built in vacuum, so that the problem of unsmooth drainage occurs. The utility model provides a drainage system can solve aforementioned problem.

Before the steam turbine is in the run-on state and after the steam turbine is shut down, the pneumatic auxiliary steam valve 10 on the steam supply pipeline 15 is in the closed state, the stop valve B11 on the water drain pipeline 16 is in the closed state, the pneumatic drain valve 6 on the drain pipeline 14 is in the closed state, and other pipe fittings are in the open state. Draining the drained water to a second-stage drainage collector 2 through a first-stage drainage collector 1 and a connecting pipeline 13, (a) when the water level in the second-stage drainage collector 2 reaches a limit value, closing a pneumatic drainage valve 4 on the connecting pipeline 13, opening a pneumatic auxiliary steam valve 10 on a steam supply pipeline 15 after delaying for 2 seconds, draining the drained water in the second-stage drainage collector 2 to a drainage vertical pipe of a drainage flash tank through a drainage pipeline 14 under the action of auxiliary steam with pressure; (b) and (b) when the water level in the second-stage hydrophobic collector 2 reaches a low water level, closing the pneumatic auxiliary steam valve 10 on the steam supply pipeline 15, delaying for 10 seconds, opening the pneumatic drain valve 4 on the connecting pipeline 13, continuously draining the hydrophobic water in the first-stage hydrophobic collector 1 to the second-stage hydrophobic collector 2, and when the water level in the second-stage hydrophobic collector 2 reaches a limit value, operating according to the hydrophobic process in the step (a).

And when the steam turbine returns to normal operation, the electric auxiliary steam valve 7 and the pneumatic auxiliary steam valve 10 on the steam supply pipeline 15 are closed in sequence, and the water drainage is carried out by adopting the conventional logic.

When equipment maintenance is required, the stop valves B11 on the water discharge pipelines 16 of the first-stage hydrophobic collector 1 and the second-stage hydrophobic collector 2 are opened, and the residual hydrophobic water in the first-stage hydrophobic collector 1 and the second-stage hydrophobic collector 2 is discharged.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A low level arranges combustion engine drainage system which characterized in that: comprises a primary hydrophobic collector (1) and a secondary hydrophobic collector (2);

the primary hydrophobic collector (1) is communicated with the secondary hydrophobic collector (2) through a connecting pipeline (13), and a pneumatic drain valve (4) is arranged on the connecting pipeline (13);

the secondary drainage collector (2) is connected with an auxiliary steam source through a steam supply pipeline (15), and a pneumatic auxiliary steam valve (10) and an electric auxiliary steam valve (7) are arranged on the steam supply pipeline (15);

the secondary drainage collector (2) is connected to a drainage vertical pipe through a drainage pipeline (14), and a stop valve A (5) and a pneumatic drainage valve (6) are arranged on the drainage pipeline (14).

2. The drainage system for the low-level arranged combustion engine according to claim 1, wherein: and a liquid level meter (12) is arranged on the secondary hydrophobic collector (2) and is used for detecting and displaying the water level condition in the secondary hydrophobic collector (2).

3. The drainage system for the low-level arranged combustion engine according to claim 1, wherein: the primary drainage collector (2) is connected with a water drain pipeline (16), and a stop valve B (11) is arranged on the water drain pipeline (16).

4. The drainage system for the low-level arranged combustion engine according to claim 1, wherein: the secondary drainage collector (2) is connected with a water drain pipeline (16), and a stop valve B (11) is arranged on the water drain pipeline (16).

5. The drainage system for the low-level arranged combustion engine according to claim 1, wherein: and a single-stage throttle rod (9) and a check valve B (8) are also arranged on the steam supply pipeline (15).

6. The drainage system for the low-level arranged combustion engine according to claim 1, wherein: and a check valve A (3) is also arranged on the connecting pipeline (13).