CN108008068B - Steam turbine final humidity detection device and steam turbine - Google Patents

Abstract

The invention discloses a steam turbine final stage humidity detection device and a steam turbine. The device includes a probe, a clamp, a sleeve, a ball valve and a control mechanism. When this device is used, the sleeve is fixed on the inner wall of the cylinder. First, the probe obtains a frequency value when the ball valve is closed; then the ball valve is opened by starting the control mechanism, so that steam enters from the front end of the sleeve and passes through the probe to obtain The frequency value in this state is finally calculated from the two measured values to obtain the real-time turbine final humidity. This process does not require the movement of the probe, that is, there is no involvement of the guide rail, so the phenomenon of track jamming is avoided; and the device is installed entirely in the turbine cylinder, and there is no device that penetrates the cylinder wall, so it does not involve the problem of vacuum leakage. . Therefore, the steam turbine final stage humidity detection device disclosed in the present invention can prevent the occurrence of vacuum leakage while avoiding track jamming, and solves the problems in the prior art.

Description

A steam turbine final stage humidity detection device and steam turbine

Technical field

The present invention relates to the field of detection, and more specifically, to a steam turbine final stage humidity detection device and a steam turbine.

Background technique

In the field of steam turbine operation, the operating parameters at each stage are directly related to the economic performance and safety performance of the system. For the humidity of the final stage of the steam turbine, its conditions in each state cannot be directly obtained through other parameters, and relevant equipment needs to be used for detection.

As far as the existing technology is concerned, there are two commonly used methods for measuring the humidity of the final stage of a steam turbine, one is outside the cylinder and the other is inside the cylinder. For out-of-cylinder detection, the steam collected at the final stage passes through a probe with a sleeve to measure relevant data; the disadvantage of this method is that in order to achieve the thermal equilibrium state of the steam during detection, a large amount of steam needs to pass through the probe, which is a time-consuming process It is laborious and not conducive to real-time monitoring. In-cylinder detection, that is, the probe and sleeve are installed in the cavity of the steam turbine, and the handle to control the movement of the probe is installed outside the cavity; when measuring: first measure the steam parameter value when the probe is in the sleeve; then manually pull the probe into the sleeve outside the cylinder to measure the parameter values in this state; finally, through these two parameters, the humidity of the final stage of the steam turbine under this working condition is obtained. Although it can meet the needs of real-time monitoring, this method still has certain flaws: first, the detection device has both internal and external components, and its sealing is poor, which can easily cause vacuum leakage in the turbine; secondly, this measurement method requires a track for the movement of the probe, and the track Jamming may easily occur during long-term use, which may affect the final test results.

Therefore, how to prevent the occurrence of vacuum leakage while avoiding track jamming is an urgent problem to be solved in this field at this stage.

Contents of the invention

In view of this, the purpose of the present invention is to provide a steam turbine final stage humidity detection device, which can prevent the occurrence of vacuum leakage while avoiding track jamming, and solve the problems in the existing technology. Another object of the present invention is to provide a steam turbine that includes the above-mentioned steam turbine final stage humidity detection device. Therefore, the occurrence of vacuum leakage can be prevented while avoiding track jamming.

A steam turbine final stage humidity detection device, including: a probe, a clip used to fix the probe, a sleeve set outside the probe and the clamp, and is arranged at the front end of the sleeve and the inner diameter of the sleeve Matching ball valve, a control mechanism for controlling the opening and closing of the ball valve; the rear end of the sleeve is in an open state; the inner wall of the sleeve is fixed to the clip, and the outer wall of the sleeve is connected to the inner wall of the cylinder phase fixed.

Preferably, in the steam turbine final stage humidity detection device, one end of the ball valve is fixed to the front end of the sleeve through a flange connection.

Preferably, in the steam turbine final stage humidity detection device, the end of the ball valve that is not connected to the sleeve is provided with a wedge-shaped structure.

Preferably, in the steam turbine final stage humidity detection device, the control mechanism drives the opening and closing of the ball valve through electromagnetic induction.

Preferably, in the steam turbine final stage humidity detection device, the inner wall of the sleeve is fixed to the clamp through a connecting piece.

Preferably, in the steam turbine final stage humidity detection device, the sleeve wall is provided with a through hole fixed to the connector; one end of the connector passes through the through hole and is fixed to the clip. , the other end of the connecting piece is fixed to the inner wall of the cylinder.

Preferably, in the steam turbine final stage humidity detection device, the connecting piece is a connecting pipe.

Preferably, in the steam turbine final stage humidity detection device, the connecting piece is fixed to the clip by welding.

Preferably, in the steam turbine final stage humidity detection device, the connecting piece is fixed to the inner wall of the cylinder by welding.

A steam turbine equipped with a steam turbine final stage humidity detection device as described in any of the above items.

The steam turbine final stage humidity detection device provided by the invention includes: a probe, a clip for fixing the probe, a sleeve set outside the probe and the clamp, and is arranged at the front end of the sleeve and the sleeve A ball valve whose inner diameter matches the control mechanism used to control the opening and closing of the ball valve; the rear end of the sleeve is in an open state; the inner wall of the sleeve is fixed to the clip, and the outer wall of the sleeve is The inner wall of the cylinder is fixed. When this device is used, the sleeve is fixed on the inner wall of the cylinder. First, the probe obtains a frequency value when the ball valve is closed; then the ball valve is opened by starting the control mechanism, so that steam enters from the front end of the sleeve and passes through the probe to obtain The frequency value in this state is finally calculated from the two measured values to obtain the real-time turbine final stage humidity. This process does not require the movement of the probe, that is, there is no involvement of the guide rail, so the phenomenon of track jamming is avoided; and the device is installed entirely in the turbine cylinder, and there is no device that penetrates the cylinder wall, so it does not involve the problem of vacuum leakage. . Therefore, the steam turbine final stage humidity detection device disclosed in the present invention can prevent the occurrence of vacuum leakage while avoiding track jamming, and solves the problems in the prior art.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic diagram of a steam turbine final stage humidity detection device in a specific embodiment of the present invention;

Figure 2 is a schematic diagram of the detection part of the steam turbine final stage humidity detection device in the specific embodiment of the present invention;

Figure 3 is a schematic diagram of the control part of the steam turbine final stage humidity detection device in the specific embodiment of the present invention.

In Figure 1-Figure 3:

Probe - 1, clamp - 2, sleeve - 3, ball valve - 4, control mechanism - 5, connector - 6, flange - 7, wedge structure - 8.

Detailed ways

The core of this specific embodiment is to provide a steam turbine final stage humidity detection device, which can prevent the occurrence of vacuum leakage while avoiding track jamming, and solves the problems in the existing technology.

Hereinafter, embodiments will be described with reference to the drawings. In addition, the embodiments shown below do not limit the invention described in the claims in any way. In addition, all the contents of the structures shown in the following examples are not limited to what is necessary as a solution to the invention described in the claims.

The steam turbine final stage humidity detection device provided by this specific embodiment mainly includes: probe 1, clamp 2, sleeve 3, ball valve 4, and control mechanism 5. The probe 1 is used to detect the final humidity of the steam turbine, and the clamp 2 is used to fix the probe 1; the sleeve 3 is set outside the clamp 2 and the probe 1, wrapping them, and the inner wall of the sleeve 3 is in contact with the clamp 2 The outer wall is fixed to the inner wall of the cylinder; the sleeve 3 itself is a structure with openings at both ends, and a ball valve 4 is provided at the front end, which can seal the front end; the control mechanism 5 controls the opening and closing of the ball valve 4. When this device is used, the sleeve 3 is fixed on the inner wall of the cylinder. First, the probe 1 obtains a frequency value when the ball valve 4 is closed; then the ball valve 4 is opened by starting the control mechanism 5 to allow steam to enter from the front end of the sleeve 3 , and obtain the frequency value in this state through probe 1, and finally obtain the real-time turbine final stage humidity through the two measured values. This process does not require the movement of the probe 1, that is, there is no involvement of the guide rail, so the phenomenon of track jamming is avoided; and the device is installed entirely in the turbine cylinder, and there is no device that penetrates the cylinder wall, so it does not involve vacuum leakage. question. Therefore, the steam turbine final stage humidity detection device disclosed in the present invention can prevent the occurrence of vacuum leakage while avoiding track jamming, and solves the problems in the prior art. Please see Figure 1-Figure 3 for details.

In the steam turbine final stage humidity detection device provided by this specific embodiment, one end of the ball valve 4 is connected to the front end of the sleeve 3 through a flange 7, or other connection methods that can play the same role; the other end is provided with a wedge-shaped structure 8 , this setting is to reduce the impact of this device on the air flow outside the sleeve 3 as much as possible, thereby further ensuring the thermal balance between the air flow inside the sleeve 3 and the external air flow, and improving the accuracy of each parameter.

In the steam turbine final stage humidity detection device provided by this embodiment, the control mechanism 5 can control the opening and closing of the ball valve 4 through electromagnetic induction; this design can more conveniently control the opening and closing of the ball valve 4 without the need to design other complex devices.

In the steam turbine final stage humidity detection device provided in this specific embodiment, the inner wall of the sleeve 3 can be connected to the clip 2 through the connecting piece 6 . The wall of the sleeve 3 can be provided with a through hole fixed to the connector 6; one end of the connector 6 passes through the through hole and is fixed to the clip 2, and the other end is fixed to the inner wall of the cylinder. And the connecting piece 6 can be a connecting pipe. This design is to enable the necessary lines involved in the operation of the device to pass through the connecting pipe to facilitate pipeline management. Please see Figure 1-Figure 3 for details.

In the steam turbine final stage humidity detection device provided by this specific embodiment, the connection method between the connecting piece 6, the clamp 2 and the inner wall of the cylinder can be welding, or other connection methods that can play the same role.

It should be noted that a steam turbine equipped with the final-stage humidity detection device disclosed in the present invention is also within the scope of rights protection of the present invention.

The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A final humidity detection device for a steam turbine, comprising: the probe (1) is used for fixing a clamp (2) of the probe (1), a sleeve (3) sleeved outside the probe (1) and the clamp (2), a ball valve (4) arranged at the front end of the sleeve (3) and matched with the inner diameter of the sleeve (3), and a control mechanism (5) used for controlling the opening and closing of the ball valve (4); the rear end of the sleeve (3) is in an opening state; the inner wall of the sleeve (3) is fixed with the clip (2), and the outer wall of the sleeve (3) is fixed with the inner wall of the cylinder.

2. The final humidity detection device of a steam turbine according to claim 1, wherein one end of the ball valve (4) is connected and fixed with the front end of the sleeve (3) through a flange (7).

3. The last stage humidity detection device of a steam turbine according to claim 1, wherein one end of the ball valve (4) which is not connected with the sleeve (3) is provided with a wedge-shaped structure (8).

4. The final humidity detection device of a steam turbine according to claim 1, wherein the control mechanism (5) drives the opening and closing of the ball valve (4) by electromagnetic induction.

5. The last stage humidity detection device of a steam turbine according to claim 1, wherein the inner wall of the sleeve (3) is fixed to the clip (2) by a connecting piece (6).

6. The last stage humidity detection device of a steam turbine according to claim 5, wherein the wall of the sleeve (3) is provided with a through hole fixed with the connecting piece (6); one end of the connecting piece (6) penetrates through the through hole and is fixed with the clip (2), and the other end of the connecting piece (6) is fixed with the inner wall of the cylinder.

7. The last stage humidity detection device of a steam turbine according to claim 6, wherein the connecting member (6) is a connecting pipe.

8. The final stage humidity detection apparatus of a steam turbine according to claim 5, wherein the connection member (6) is fixed to the clip (2) by welding.

9. The last stage humidity detection device of a steam turbine according to claim 6, wherein the connecting member (6) is fixed to the inner wall of the cylinder by welding.

10. A steam turbine, wherein a final stage humidity detection apparatus of the steam turbine as claimed in any one of claims 1 to 9 is installed.