Steam-water separating device for steam turbine shaft seal

Abstract

The utility model relates to steam turbine technical field discloses a steam-water separating device for steam turbine shaft seal, the steam-water separating device includes the horizontal placement cylinder, the eccentricity of cylinder upper end is provided with the steam inlet pipe, the steam inlet pipe links to each other with the water spray desuperheater export, the cylinder inside coaxiality is provided with the steam outlet pipe, one end of steam outlet pipe links to each other with cylinder fixed connection, the other end extends to cylinder outside and links to each other with the shaft seal steam supply pipeline, the part bottom of steam outlet pipe located cylinder inside is equipped with the opening, the filter screen of arc structure is still provided in the cylinder inside, the filter screen is located steam outlet pipe below. The utility model is favorable for reducing the water content in the steam of entering the rear shaft seal.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, specifically to a steam-water separation device for steam turbine shaft seals. Background Technology

[0002] Condensing steam turbine shaft sealing systems typically employ a self-sealing mechanism. During startup, a stream of high-temperature auxiliary steam is introduced. Part of this high-temperature steam enters the front shaft seal, while the other part is desuperheated by water spraying to match its temperature to that of the rotor metal before being sent to the rear shaft seal. This achieves isolation between the front and rear shaft seals and the atmosphere, ensuring a vacuum in the unit. When the unit reaches a certain load, the high-temperature steam leaking from the front shaft seal is desuperheated by water spraying and then sent to the rear shaft seal. At this point, the unit's shaft seals do not require external auxiliary steam as a sealing steam source, achieving a self-sealing operating state.

[0003] However, when the steam fed into the rear shaft seal is de-cooled by water spray, the atomization effect of the nozzle is limited, and water is often mixed in with the steam. If it is directly fed into the rear shaft seal, the water will come into contact with the rotor and other structures, which will affect the normal operation of the unit and bring safety hazards to the unit. Utility Model Content

[0004] The technical objective of this invention is to address the shortcomings of the prior art by providing a steam-water separation device for turbine shaft seals that helps reduce the moisture content in the steam entering the rear shaft seal.

[0005] The technical solution adopted in this utility model is as follows: A steam-water separation device for a steam turbine shaft seal, the steam-water separation device comprising a horizontally placed cylinder; The upper end of the cylinder is eccentrically provided with a steam inlet pipe, which is connected to the outlet of the water spray desuperheater. A steam outlet pipe is coaxially arranged inside the cylinder. One end of the steam outlet pipe is fixedly connected to the cylinder, and the other end extends to the outside of the cylinder and is connected to the shaft seal steam supply pipeline. The bottom part of the steam outlet pipe located inside the cylinder has an opening. The cylinder is also equipped with an arc-shaped filter screen located below the steam outlet pipe.

[0006] The aforementioned technical measures connect the steam inlet pipe to the outlet of the water spray desuperheater, allowing the steam, after being desuperheated by the water spray desuperheater, to enter the cylinder through the steam inlet pipe. Due to the eccentric setting of the steam inlet pipe and the cylinder, the steam changes from linear motion to tangential motion along the inner wall of the cylinder after entering the cylinder. During tangential motion, it comes into contact with the filter screen. Since water has a higher specific gravity than steam, most of the water separates from the steam due to inertia after contacting the filter screen. The steam continues to move along the arc-shaped filter screen, and under the action of centrifugal force, the remaining water also separates from the steam. The water collects at the bottom of the cylinder through the filter screen, and the dehydrated steam enters the steam outlet pipe through the opening and is then transported to the shaft seal steam supply channel.

[0007] The above-mentioned technical measures utilize the eccentric setting of the steam inlet pipe to make the steam move tangentially, and then use the difference in specific gravity between water and steam to separate water and steam through a filter screen. Then, the centrifugal force of rotation is used to separate water and steam again. This helps to remove moisture mixed in the steam, reduces the moisture content of the steam entering the shaft seal steam supply channel, helps to ensure the quality of steam, and thus helps to ensure the safe operation of the unit.

[0008] Furthermore, a drainage pipe is provided at the bottom of the cylinder, and the drainage pipe is connected to the recycling device.

[0009] The above-mentioned technical measures, by setting a condensate drain pipe at the bottom of the cylinder, can discharge the water separated from the steam; the condensate drain pipe is connected to the recovery device, which is conducive to the reuse of water.

[0010] Furthermore, the cylinder has a front end plate at one end along its axial direction and a rear end plate at the other end; One end of the steam outlet pipe is welded to the rear end plate, and the other end passes through the front end plate and the cylinder in sequence and extends to the outside of the cylinder, and is welded to the front end plate.

[0011] The above-mentioned technical measures, by setting front and rear plates on both sides of the cylinder axially and welding them to the steam outlet pipe respectively, not only support the steam outlet pipe but also improve the sealing performance and help avoid steam leakage.

[0012] Furthermore, the front and rear ends of the filter screen are fixedly connected to the front end plate and the rear end plate, respectively, and the left and right ends of the filter screen are fixedly connected to both sides of the inner wall of the cylinder.

[0013] The above-mentioned technical measures improve the stability of the filter by fixing the four ends of the filter screen.

[0014] Furthermore, the filter screen is provided with a plurality of evenly arranged filter holes.

[0015] The above-mentioned technical measures improve the filter screen by setting multiple evenly distributed filter holes, so that the filter screen is subjected to uniform force.

[0016] Furthermore, the pore size of the filter is 8mm to 12mm.

[0017] The above-mentioned technical measures can be flexibly adjusted according to the amount of steam by controlling the aperture of the filter holes.

[0018] Furthermore, the steam inlet pipe is connected to the outlet of the water spray desuperheater via a first flange.

[0019] In the above technical measures, the steam inlet pipe is connected to the outlet of the water spray desuperheater via the first flange, which facilitates disassembly.

[0020] Furthermore, the steam outlet pipe is connected to the shaft seal steam supply pipe via a second flange.

[0021] In the above technical measures, the steam outlet pipe is connected to the shaft seal steam supply pipeline through a second flange, which facilitates disassembly.

[0022] Furthermore, the opening is an arc-shaped structure extending axially along the steam outlet pipe.

[0023] The opening structure in the above-mentioned technical measures is simple and easy to form.

[0024] Furthermore, a gap is provided between the filter screen and the bottom of the cylinder.

[0025] The above-mentioned technical measures facilitate water accumulation by creating a gap between the filter screen and the bottom of the cylinder.

[0026] One or more technical solutions provided by this utility model have at least the following technical effects or advantages: This invention connects the steam inlet pipe to the outlet of the water spray desuperheater, allowing the steam, after being desuperheated by the water spray desuperheater, to enter the cylinder through the steam inlet pipe. Due to the eccentric arrangement of the steam inlet pipe and the cylinder, the steam changes from linear motion to tangential motion along the inner wall of the cylinder after entering the cylinder. During tangential motion, it comes into contact with the filter screen. Since water has a higher specific gravity than steam, most of the water separates from the steam due to inertia after contacting the filter screen. The steam continues to move along the arc-shaped filter screen, and under the action of centrifugal force, the remaining water also separates from the steam. The water collects at the bottom of the cylinder through the filter screen, and the dehydrated steam enters the steam outlet pipe through the opening and is then transported to the shaft seal steam supply channel.

[0027] This invention utilizes the eccentric setting of the steam inlet pipe to make the steam move tangentially, and then uses the difference in specific gravity between water and steam to separate them through a filter screen. Then, centrifugal force is used to separate the water and steam again. This helps to remove moisture mixed in the steam, reduces the moisture content of the steam entering the shaft seal steam supply channel, helps to ensure the quality of the steam, and thus helps to ensure the safe operation of the unit. Attached Figure Description

[0028] The accompanying drawings, which are provided to further illustrate the embodiments of the present invention and constitute a part of the present invention, do not constitute a limitation thereof. Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a left view of this utility model; Figure 3 yes Figure 2 Schematic diagram of the structure at point AA; Among them, 1-cylinder; 2-steam inlet pipe; 3-steam outlet pipe; 4-opening; 5-filter screen; 6-drain pipe; 7-front end plate; 8-rear end plate; 9-first flange; 10-second flange. Detailed Implementation

[0029] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of this utility model and the features within them can be combined with each other.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0031] Reference Figures 1-3 This embodiment provides a steam-water separation device for turbine shaft seals. The steam-water separation device includes a horizontally placed cylinder 1; an inlet pipe 2 is eccentrically arranged at the upper end of the cylinder 1, the inlet pipe 2 is connected to the outlet of the water spray desuperheater, and the inlet pipe 2 is connected to the outlet of the water spray desuperheater through a first flange 9.

[0032] A steam outlet pipe 3 is coaxially arranged inside the cylinder 1. One end of the steam outlet pipe 3 is fixedly connected to the cylinder 1, and the other end extends to the outside of the cylinder 1 and is connected to the shaft seal steam supply pipeline. The steam outlet pipe 3 is connected to the shaft seal steam supply pipeline through the second flange 10. The bottom of the part of the steam outlet pipe 3 located inside the cylinder 1 is provided with an opening 4. The opening 4 is an arc-shaped structure extending along the axial direction of the steam outlet pipe 3.

[0033] The opening 4 is located at the bottom of the steam outlet pipe 3, which helps to prevent water separated from the steam due to centrifugal force from entering the steam outlet pipe 3.

[0034] Inside the cylinder 1, there is also an arc-shaped filter screen 5. The filter screen 5 is located below the steam outlet pipe 3. The filter screen 5 has multiple evenly arranged filter holes with a diameter of about 8mm.

[0035] A gap is provided between the filter screen 5 and the bottom of the cylinder 1 to collect the water flowing out through the filter screen 5.

[0036] Among them, the arc-shaped structure of filter screen 5 can guide the direction of steam movement, and filter screen 5 can also be other streamlined structures.

[0037] A drain pipe 6 is provided at the bottom of the cylinder 1, and the drain pipe 6 is connected to the recycling device.

[0038] The recovery device can be a condenser or a steam exhaust device, etc.

[0039] One end of the cylinder 1 is provided with a front end plate 7 and the other end is provided with a rear end plate 8; the front end plate 7 is welded to the cylinder 1 and the rear end plate 8 is welded to the cylinder 1. One end of the steam outlet pipe 3 is welded to the rear end plate 8, and the other end passes through the front end plate 7 and the cylinder 1 in sequence and extends to the outside of the cylinder 1, and is welded to the front end plate 7.

[0040] The front and rear ends of the filter screen 5 are fixedly connected to the front end plate 7 and the rear end plate 8, respectively, and the left and right ends of the filter screen 5 are fixedly connected to the inner walls of the cylinder 1. The fixed connection between the filter screen 5 and the front end plate 7, the rear end plate 8 and the cylinder 1 can be achieved by bolts or other means.

[0041] In application, the steam after being desuperheated by the water spray desuperheater enters the cylinder 1 through the steam inlet pipe 2. Due to the eccentric setting of the steam inlet pipe 2 and the cylinder 1, the steam changes from linear motion to tangential motion along the inner wall of the cylinder after entering the cylinder 1. During the tangential motion, it will come into contact with the filter screen 5. Since the specific gravity of water is greater than that of steam, after contacting the filter screen 5, most of the water will separate from the steam under the action of inertia. The steam continues to move along the arc-shaped filter screen 5. Under the action of centrifugal force, the remaining water will also separate from the steam. The water is collected in the gap between the filter screen 5 and the bottom of the cylinder 1, and then discharged through the drain pipe 6. The dehydrated steam enters the steam outlet pipe 3 through the opening 4 and is transported to the shaft seal steam supply channel, and finally into the turbine shaft seal.

[0042] Example 2 The rest of the content of this embodiment is the same as that of embodiment 1, except that: The pore size of the filter is approximately 12mm.

[0043] Example 3 The rest of the content of this embodiment is the same as that of embodiment 1, except that: The pore size of the filter is approximately 10 mm.

[0044] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0045] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A steam-water separation device for turbine shaft seals, characterized in that: The steam-water separator includes a horizontally placed cylinder (1); The upper end of the cylinder (1) is eccentrically provided with a steam inlet pipe (2), which is connected to the outlet of the water spray desuperheater; The cylinder (1) is coaxially provided with a steam outlet pipe (3). One end of the steam outlet pipe (3) is fixedly connected to the cylinder (1), and the other end extends to the outside of the cylinder (1) and is connected to the shaft seal steam supply pipeline. The bottom part of the steam outlet pipe (3) located inside the cylinder (1) has an opening (4). The cylinder (1) is also equipped with an arc-shaped filter screen (5), which is located below the steam outlet pipe (3).

2. The steam-water separator for turbine shaft seals according to claim 1, characterized in that: The bottom of the cylinder (1) is provided with a drainage pipe (6), which is connected to the recycling device.

3. The steam-water separator for turbine shaft seals according to claim 1, characterized in that: The cylinder (1) has a front end plate (7) at one end in the axial direction and a rear end plate (8) at the other end. One end of the steam outlet pipe (3) is welded to the rear end plate (8), and the other end passes through the front end plate (7) and the cylinder (1) in sequence and extends to the outside of the cylinder (1), and is welded to the front end plate (7).

4. The steam-water separator for turbine shaft seals according to claim 3, characterized in that: The front and rear ends of the filter screen (5) are fixedly connected to the front end plate (7) and the rear end plate (8) respectively, and the left and right ends of the filter screen (5) are fixedly connected to the inner walls of the cylinder (1) respectively.

5. The steam-water separator for turbine shaft seals according to claim 1, characterized in that: The filter screen (5) has multiple evenly arranged filter holes.

6. The steam-water separator for turbine shaft seals according to claim 5, characterized in that: The pore size of the filter is 8mm to 12mm.

7. The steam-water separator for turbine shaft seals according to claim 1, characterized in that: The steam inlet pipe (2) is connected to the outlet of the water spray desuperheater via the first flange (9).

8. The steam-water separator for turbine shaft seals according to claim 1, characterized in that: The steam outlet pipe (3) is connected to the shaft seal steam supply pipe via the second flange (10).

9. The steam-water separator for turbine shaft seals according to claim 1, characterized in that: The opening (4) is an arc-shaped structure extending axially along the steam outlet pipe (3).

10. The steam-water separator for turbine shaft seals according to claim 1, characterized in that: A gap is provided between the filter screen (5) and the bottom of the cylinder (1).

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