CN217501757U

CN217501757U - Anti-thrust-back system of steam turbine

Info

Publication number: CN217501757U
Application number: CN202221540448.9U
Authority: CN
Inventors: 周宗建; 周宸; 周功霆; 马卫华; 徐虎成; 李丘; 吴勇; 德华; 莫彬; 胡小强; 钱雪锋; 沈国琪
Original assignee: Changxing Xincheng Environmental Protection Co ltd
Current assignee: Changxing Xincheng Environmental Protection Co ltd
Priority date: 2022-06-20
Filing date: 2022-06-20
Publication date: 2022-09-27
Anticipated expiration: 2032-06-20

Abstract

The utility model relates to a reverse thrust prevention system of a steam turbine, which comprises the steam turbine, wherein a steam inlet of the steam turbine is connected with a main steam pipeline; the steam outlet of the steam turbine is connected with a steam transmission pipeline, and the steam transmission pipeline is connected with an industrial steam pipeline; the steam delivery pipeline is connected with a first steam exhaust pipeline, and a quick-opening electromagnetic valve is arranged on the first steam exhaust pipeline; an automatic main valve is arranged on the main steam pipeline; the steam transmission pipeline is provided with a check valve and a manual isolating valve in series, and is also connected with a steam exhaust pipeline III. Aiming at the defects of the prior art, a steam exhaust pipeline is additionally arranged on a steam transmission pipeline, and a quick-opening electromagnetic valve synchronously controlled with an automatic main steam valve and an electric air exhaust steam valve is arranged on the pipeline, so that the pressure relief capacity of the system is enhanced under the condition of not changing the working mode of the original system, and the problem that the steam turbine is damaged due to reverse thrust of the steam turbine caused by low pressure relief efficiency in the prior art is solved.

Description

Anti-thrust-back system of steam turbine

Technical Field

The utility model relates to a prevent reverse system field that pushes away especially relates to a reverse system that pushes away is prevented to steam turbine.

Background

If the turbine is suddenly stopped in emergency during operation, high-pressure steam can be caused to flow back, so that the turbine is reversely pushed, and the internal structure of the turbine is damaged. At present, in the field of a reverse thrust system is prevented by a steam turbine, an electric air exhaust valve is arranged at a steam exhaust pipe of the steam turbine in a common pressure relief mode, but the device is long in opening time and cannot replace the steam turbine to rapidly reduce pressure.

A chinese utility model patent of patent No. cn201310556509.x, it discloses a steam turbine bearing seal temperature and pressure reduction device, through set up the admission pipe that has the admission valve and set up the desuperheater between steam boiler and steam turbine at the admission end, can reduce the temperature and step down to certain parameter with the steam cooling of steam boiler in production, then supply the bearing seal with steam stability again, no matter how undulant of the load of steam turbine, the steam supply pressure of bearing seal can both remain stable. However, this design has the following problems: the steam turbine shutdown protection device is not arranged, and when the steam turbine is suddenly shut down in an emergency, the high-pressure steam backflow can cause the reverse thrust of the steam turbine after the automatic main steam valve is closed, so that the steam turbine is damaged.

Disclosure of Invention

The utility model aims at prior art's weak point, through additionally increasing an exhaust pipe in balanced sleeve department to set up one on the pipeline with automatic main throttle valve and electronic to empty exhaust valve synchro control's quick-open solenoid valve, strengthened its pressure release ability under the condition that does not change former system working method, solved among the prior art pressure release inefficiency and leaded to the steam turbine to push back and damage the problem of steam turbine.

In order to achieve the above object, the utility model provides a following technical scheme:

a reverse thrust prevention system of a steam turbine comprises the steam turbine, wherein a steam inlet of the steam turbine is connected with a main steam pipeline; the steam outlet of the steam turbine is connected with a steam transmission pipeline, and the steam transmission pipeline is connected with an industrial steam pipeline; the steam delivery pipeline is connected with a first steam exhaust pipeline, and a quick-opening electromagnetic valve is arranged on the first steam exhaust pipeline; an automatic main throttle valve is arranged on the main steam pipeline; the steam transmission pipeline is provided with a check valve and a manual isolating valve in series, and is also connected with a steam exhaust pipeline III.

Preferably, the steam turbine is coaxially provided with a front shaft seal at the steam inlet end, the front shaft seal is connected with a second steam exhaust pipeline, and the second steam exhaust pipeline is provided with a steam seal.

Preferably, the steam turbine is coaxially provided with a rear shaft seal at the steam outlet end, and the rear shaft seal is connected with a steam collector.

Preferably, an electric steam exhaust valve is arranged on the steam exhaust pipeline III.

Preferably, the first steam exhaust pipeline and the second steam exhaust pipeline both lead to a deaerator.

Preferably, the quick-opening electromagnetic valve, the automatic main valve and the electric emptying exhaust valve are synchronously controlled by a main controller.

The utility model has the advantages that:

(1) the utility model adds a steam exhaust pipeline on the steam transmission pipeline, and the steam exhaust pipeline is provided with the quick-opening electromagnetic valve which can be quickly opened when the steam turbine is stopped, so as to convey high-pressure steam to the low-pressure deaerator, prevent the steam turbine from generating reverse thrust, and ensure the safety of the steam turbine parts;

(2) the utility model discloses a to open solenoid valve, automatic main steam valve and electronic to empty exhaust valve by main control system synchronous control soon, when breaking down, main control system can give signal transmission for open solenoid valve, automatic main steam valve and electronic to empty exhaust valve soon, can make and open solenoid valve, automatic main steam valve and electronic to empty exhaust valve and trigger together in the twinkling of an eye that the steam turbine shut down, make the whole system have higher step-down efficiency.

To sum up, the anti-thrust-back system of the steam turbine has the advantages of high pressure reduction efficiency, simple control mode and the like, and is particularly suitable for the field of anti-thrust-back systems.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

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

In the figure: 1. a steam turbine; 2. a main steam pipe; 3. a steam delivery pipeline; 4. an industrial steam pipeline; 5. a first steam exhaust pipeline; 6. a third steam exhaust pipeline; 7. a front shaft seal; 8. a second steam exhaust pipeline; 9. a rear shaft seal; 10. a deaerator; 21. an automatic main valve; 31. a check valve; 32. a manual isolation valve; 51. quickly opening the electromagnetic valve; 61. an electric evacuation steam valve; 81. steam sealing; 91. a steam collector.

Detailed Description

The technical solution in the embodiment of the present invention is clearly and completely described below with reference to the accompanying drawings.

Example one

As shown in fig. 1, the utility model provides a system for preventing thrust reversal of a steam turbine, which comprises a steam turbine 1, wherein a steam inlet of the steam turbine 1 is connected with a main steam pipeline 2; a steam outlet of the steam turbine 1 is connected with a steam transmission pipeline 3, and the steam transmission pipeline 3 is connected with an industrial steam pipeline 4; the method is characterized in that: the steam delivery pipeline 3 is connected with a first steam exhaust pipeline 5, and a quick-opening electromagnetic valve 51 is arranged on the first steam exhaust pipeline 5; an automatic main throttle valve 21 is arranged on the main steam pipeline 2; the steam transmission pipeline 3 is provided with a check valve 31 and a manual isolating valve 32 in series, and the steam transmission pipeline 3 is further connected with a steam exhaust pipeline III 6. The manual isolation valve is used for manually communicating the industrial gas pipeline when the steam turbine is started or manually isolating the connection with the industrial gas pipeline when the steam turbine is stopped. Through set up one at steam transmission pipeline 3 department and have exhaust steam pipe way 5 of opening solenoid valve 51 soon, can open fast when steam turbine 1 stops, carry high-pressure steam to oxygen-eliminating device 11, guarantee steam turbine 1's safety, prevent to take place the backstepping.

Further, an electric air-to-air exhaust valve 61 is arranged on the exhaust pipeline III 6, and the electric air-to-air exhaust valve 61 is used for exhausting high-pressure steam to the atmosphere when the steam turbine 1 is suddenly stopped.

Further, the quick-opening electromagnetic valve 51, the automatic main steam valve 21 and the electric to-the-air exhaust steam valve 61 are synchronously controlled by the main controller, when a fault occurs, the main control system can simultaneously send signals to the quick-opening electromagnetic valve 51, the automatic main steam valve 21 and the electric to-the-air exhaust steam valve 61, so that the quick-opening electromagnetic valve 51, the automatic main steam valve 21 and the electric to-the-air exhaust steam valve 61 are triggered together at the moment of shutdown of the steam turbine, and the cooperative work is realized, so that the whole set of system has higher pressure reduction efficiency.

Example two

As shown in fig. 1, in which the same or corresponding components as in the first embodiment are denoted by the same reference numerals as in the first embodiment, only the points of difference from the first embodiment will be described below for the sake of convenience. The second embodiment is different from the first embodiment in that: the steam turbine 1 is coaxially provided with a front shaft seal 7 at a steam inlet end, the front shaft seal 7 is connected with a second steam exhaust pipeline 8, and a steam seal 81 is arranged on the second steam exhaust pipeline 8.

Furthermore, the steam turbine 1 is coaxially provided with a rear shaft seal 9 at the steam outlet end, and the rear shaft seal 9 is connected with a steam collector 91. The front shaft seal 7 and the rear shaft seal 9 are rigid steam seals, when the steam turbine 1 works normally, the front shaft seal 7 and the rear shaft seal 9 are gradually depressurized through the tooth spaces, and redundant steam is recycled to the deaerator 10 or collected into the steam collector 91 through the second steam transmission pipe 8.

Further, the first steam exhaust pipeline 5 and the second steam exhaust pipeline 8 are both communicated to the deaerator 10, high-pressure steam is recycled, and resources are saved.

The working steps are as follows:

and step one, when the steam turbine is in normal operation, the steam turbine is suddenly stopped, and the main control system detects a stop signal and immediately transmits information to the quick-opening electromagnetic valve, the automatic main steam valve and the electric emptying steam exhaust valve at the same time.

And step two, after receiving a signal of the main control system, the quick-opening electromagnetic valve, the automatic main steam valve and the electric emptying steam exhaust valve are all opened, and high-pressure steam is led to the deaerator and the atmosphere.

In the description of the present invention, it is to be understood that the terms "front and back", "left and right", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or parts referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Of course, in this disclosure, those skilled in the art will understand that the terms "a" and "an" should be interpreted as "at least one" or "one or more," i.e., in one embodiment, a number of an element may be one, and in another embodiment, a number of the element may be plural, and the terms "a" and "an" should not be interpreted as limiting the number.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art in the technical suggestion of the present invention should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A reverse thrust prevention system of a steam turbine comprises the steam turbine (1), wherein a steam inlet of the steam turbine (1) is connected with a main steam pipeline (2); a steam outlet of the steam turbine (1) is connected with a steam transmission pipeline (3), and the steam transmission pipeline (3) is connected with an industrial steam pipeline (4); the method is characterized in that: the steam delivery pipeline (3) is connected with a first steam exhaust pipeline (5), and a quick-opening electromagnetic valve (51) is arranged on the first steam exhaust pipeline (5); an automatic main throttle valve (21) is arranged on the main steam pipeline (2); the steam delivery pipeline (3) is provided with a check valve (31) and a manual isolating valve (32) in series, and the steam delivery pipeline (3) is further connected with a steam exhaust pipeline III (6).

2. The anti-back-thrust system of the steam turbine according to claim 1, wherein the steam turbine (1) is coaxially provided with a front shaft seal (7) at a steam inlet end, the front shaft seal (7) is connected with a second steam exhaust pipeline (8), and a steam seal (81) is arranged on the second steam exhaust pipeline (8).

3. The anti-back-thrust system of the steam turbine according to claim 1, characterized in that the steam turbine (1) is coaxially provided with a rear shaft seal (9) at the steam outlet end, and the rear shaft seal (9) is connected with a steam collector (91).

4. Anti-back-thrust system of the steam turbine according to claim 1, characterized in that an electric evacuation exhaust valve (61) is provided on the exhaust line three (6).

5. Anti-thrust reversal system for a steam turbine according to claim 2, characterized in that both the first (5) and the second (8) steam exhaust lines lead to a deaerator (10).

6. Anti-thrust-back system of the steam turbine according to claim 4, characterized in that said quick-opening solenoid valve (51), said automatic main valve (21) and said electric-to-empty steam exhaust valve (61) are synchronously controlled by a main controller.