CN214091981U

CN214091981U - Integrated pressure reducing device of marine steam turbine

Info

Publication number: CN214091981U
Application number: CN202022423686.9U
Authority: CN
Inventors: 张旭阳; 张鲲羽; 李一兴; 李少军
Original assignee: 704th Research Institute of CSIC
Current assignee: 704th Research Institute of CSIC
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2021-08-31
Anticipated expiration: 2030-10-27

Abstract

The utility model relates to a marine steam turbine integrated form pressure relief device, the pressure relief device is integrated inboard to the outer jar of steam turbine cylinder body, make the inboard other route of arranging of a steam flow that forms of steam turbine outer jar, set up the orifice plate one of decompression in the inlet tube on the other route of arranging of steam flow, other row's import position sets up the orifice plate two of decompression on the steam turbine cylinder body, the slope of the outer jar anterior segment of steam turbine cylinder body sets up the orifice plate three of decompression, the interior most downside of flow path sets up the orifice plate four of decompression in the outer jar of steam turbine cylinder body, the outer jar inboard of steam turbine cylinder body is equipped with two blocks of orifice plates five of decompression respectively, the outer jar of steam turbine cylinder body is equipped with the condenser with the intermediate position of inner cylinder. The structure integrates the pressure reducing device of the side exhaust system to the outer cylinder of the steam turbine, so that the side exhaust steam of the steam turbine realizes the pressure reduction of the side exhaust steam through the side exhaust device arranged on the inner wall of the outer cylinder. The structure can save an independent bypass discharge part sleeve, greatly improve the integration of equipment, reduce the overall size of a unit and fully utilize the internal space of the steam turbine.

Description

Integrated pressure reducing device of marine steam turbine

Technical Field

The utility model relates to a bypass of steam turbine for marine power generation discharges pressure relief device, especially an integrated form decompression structure.

Background

Steam turbines need to have load dump capability. When the load is suddenly unloaded, most steam does not enter the interior of the steam turbine any more, but is discharged into the condenser after being decompressed by the bypass discharging device. The pressure reducing capability of the bypass vent enables a large drop in pressure of the steam after passing through the bypass vent. The condenser can maintain a certain vacuum degree inside.

Along with the increase of the power of the ship steam turbine generator unit, the steam consumption of the steam turbine also rises. The steam consumption of the steam turbine rises, so that the steam quantity passing through the side exhaust device in a burst unloading state rises along with the steam consumption, and the size of the side exhaust device also rises along with the steam consumption.

In the prior art, the bypass device is often placed outside the unit as an independent part sleeve, and steam is discharged into the condenser after being decompressed by the layer-by-layer bypass device outside the unit. The separate bypass system housing and its connections to the steam turbine will take up a large cabin space and require some space for its maintenance. With the development of ships, the requirements for miniaturization and integration of ship equipment are high.

In order to realize the pressure reduction capability of a bypass discharge system in a limited bin volume and enable the unit to have the sudden unloading capability, an integrated pressure reduction structure of a marine steam turbine is needed. At present, no integrated pressure reducing structure of the marine steam turbine exists at home and abroad.

Disclosure of Invention

The utility model aims to solve the problem that a marine steam turbine integrated form pressure relief device is proposed, the device with other exhaust system pressure relief device integrated to the steam turbine outer casing on for the other exhaust stream of steam turbine realizes the decompression of other exhaust stream through the other exhaust device that sets up on the outer cylinder inner wall. The structure can save an independent bypass discharge part sleeve, greatly improve the integration of equipment, reduce the overall size of a unit and fully utilize the internal space of the steam turbine.

In order to achieve the above purpose, the technical scheme of the utility model is that: the utility model provides a marine steam turbine integrated form pressure relief device, includes pressure relief device, steam turbine cylinder body, pressure relief device is integrated to the outer jar of steam turbine cylinder body inboard, makes the inboard bypass route that forms of steam turbine outer jar, set up the orifice plate one of decompression in the inlet tube on the bypass route of steam flow, the other import position of arranging sets up the orifice plate two of decompression on the steam turbine cylinder body, the outer jar anterior segment slope of steam turbine cylinder body sets up the orifice plate three of decompression, the outer jar of steam turbine cylinder body is interior along the most downside of flow path and sets up the orifice plate four of decompression, the outer jar inboard of steam turbine cylinder body is equipped with two orifice plates five of decompression respectively, the outer jar of steam turbine cylinder body and the intermediate position of inner cylinder are equipped with the condenser.

Further, the first orifice plate and the second orifice plate are circular orifice plates, the third orifice plate is a rectangular orifice plate, the fourth orifice plate is a fan-ring-shaped orifice plate, and the fifth orifice plate is an orifice plate in a space curved surface shape.

Furthermore, pressure reducing holes are distributed on the first, second, third, fourth and fifth pore plates.

Furthermore, a third pore plate, a fourth pore plate, a fifth pore plate, a partition plate and a rib plate are respectively welded on the inner wall of the steam turbine cylinder body.

Further, a second orifice plate is welded at the inlet of the cylinder body beside the steam turbine cylinder body.

Further, after the first pore plate is installed and enters the inner side of the side exhaust inlet pipe of the steam turbine, the inlet pipe is connected with the inlet flange of the cylinder body of the steam turbine.

The utility model has the advantages that:

the utility model discloses a marine steam turbine integrated form decompression structure replaces independent bypass to discharge pressure relief device has following advantage:

1. the circular size space of the first half of the outer cylinder of the unit and the inner space of the outer cylinder are fully utilized, the defect that the traditional external temperature and pressure reducing device needs to occupy more space is overcome by adopting the innovative design of respectively shunting one half at the left side and the right side, the through-flow channel between the inner cylinder and the outer cylinder is reasonably utilized, the problem of large flow of side-exhaust steam is solved in a very limited space, the problem of special-shaped design of the outer cylinder is avoided, and the total size and weight are greatly reduced;

2. the mode that bilateral reposition of redundant personnel, terminal are direct to the steam extraction mouth sprays is adopted, has greatly improved the homogeneity of steam flow in preceding/back, left/right all directions for the energy dissipation of side row steam and efflux process avoid the mainstream channel of steam turbine completely, directly gets into the condenser condensation after the energy dissipation, has avoided the interference of side row steam to steam turbine mainstream and steam extraction completely, even can also carry out large-traffic side row in the unit operation in-process.

3. The main steam and the side-exhaust steam inlets of the steam turbine are all arranged at the center of the width of the front end of the unit, the orientations are consistent, the positions are close, and great convenience is provided for optimizing cabin arrangement, saving cabin space and pipeline length, reducing pipeline size and weight, and improving unit and pipeline maintainability.

4. Bypass steam discharges and is a big noise source, and the side of this unit adoption is arranged the scheme and is fallen to make an uproar to the damping and has very big meaning, forms smooth steam flow passageway through the oval space of make full use of first outer cylinder of unit, has abandoned the steam flow excitation that traditional temperature and pressure reducing device baffled many times and cause, through adopting curved channel, has effectively increased steam flow energy dissipation length to make the through-flow area very be fit for the steam flow and decompress the specific volume change that the inflation brought step by step, can suppress the noise by a wide margin. Meanwhile, the multi-stage porous plates are all concentrated inside the outer cylinder, so that the outer cylinder can inhibit vibration transmission, and meanwhile, the path of outward propagation of steam flow noise is effectively cut off through the wall surface of the outer cylinder.

5. The existence of the bypass system obviously enhances the structural strength of the front side and the two sides of the outer cylinder. The strength of the upper side and the front and rear sides of the outer cylinder is obviously improved by matching with the rib plate on the outer side of the outer cylinder.

Drawings

FIG. 1 is one of the cross-sectional views of the integrated pressure relief device of the present invention in an intermediate position;

fig. 2 is a sectional view of the front side of the cylinder body of the integrated pressure reducing device of the present invention;

fig. 3 is a second cross-sectional view of the integrated pressure reducing device of the present invention in the middle position.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings and examples.

As shown in fig. 1 to 3, an integrated pressure reducing device of a marine turbine is integrated inside a turbine outer casing, and a bypass path of a steam flow is generated inside the turbine outer casing. The flow direction of the side exhaust steam flow is marked by hollow arrows in the figure. The device comprises a front rib plate 1, a rear rib plate 2, a first pore plate 3, an inlet pipe 4, a cylinder body rib plate 5, a cylinder body 6, a third pore plate 7, a fourth pore plate 8 and a fifth pore plate 9.

The first orifice plate 3 and the second orifice plate 2 are traditional round orifice plates, the third orifice plate 7 is a rectangular orifice plate, the fourth orifice plate 8 is a sector annular orifice plate, and the fifth orifice plate 9 is a spatial curved surface orifice plate. The orifice plate is distributed with pressure reducing holes.

The first pore plate 3 is arranged in the inlet pipe 4, the second pore plate 2 is arranged at the position of a side exhaust inlet on the steam turbine cylinder body, the third pore plate 7 is obliquely arranged at the front section of the steam turbine outer cylinder, the fourth pore plate 8 is arranged at the lowest side of a flow passage in the steam turbine outer cylinder, and the fifth pore plate 9 is respectively arranged on the inner side of the steam turbine outer cylinder. And a condenser is arranged in the middle of the outer cylinder and the inner cylinder of the steam turbine.

Steam enters the turbine bypass structure through the inlet pipe, and first pressure reduction is performed through the first orifice plate arranged in the inlet pipe. Then, the pressure is reduced for the second time by flowing along the axial direction and the orifice plate II arranged at the position of the side exhaust inlet on the steam turbine cylinder body. Then the steam flow turns 90 degrees, flows to two sides, and is decompressed for the third time through a third pore plate obliquely arranged at the front section of the outer cylinder of the steam turbine. The steam flows to the lowest side along the flow channel and then meets the fourth orifice plate, and fourth decompression is carried out. After being decompressed and passing through the fourth orifice plate, the steam flows along the radial direction, and two orifice plates, namely the fifth orifice plate, are respectively arranged on the inner side of the outer cylinder. The steam flow after passing through the orifice plate is injected into the middle position between the outer cylinder and the inner cylinder of the steam turbine and then enters the condenser.

The basic concept of the integrated pressure relief structure is to create a bypass flow area inside the main port by welding. Possible specific embodiments thereof are as follows:

firstly, the casting processing of the steam turbine cylinder body is completed, and a third pore plate, a fourth pore plate, a fifth pore plate, a related partition plate and a rib plate are respectively welded on the inner wall of the steam turbine cylinder body.

And welding a second pore plate at the position of the inlet of the cylinder body beside the cylinder body of the steam turbine. And mounting the first pore plate into the inner side of the exhaust inlet pipe beside the steam turbine, and then connecting the inlet pipe with the inlet flange of the cylinder body.

Claims

1. The utility model provides a marine steam turbine integrated form pressure relief device, includes pressure relief device, steam turbine cylinder body, its characterized in that: the steam turbine comprises a steam turbine cylinder body and is characterized in that a pressure reducing device is integrated on the inner side of an outer cylinder of the steam turbine cylinder body, a steam flow bypass path is formed on the inner side of the outer cylinder of the steam turbine, a first pressure reducing pore plate is arranged in an inlet pipe of the steam flow bypass path, a second pressure reducing pore plate is arranged at a bypass inlet position on the steam turbine cylinder body, a third pressure reducing pore plate is obliquely arranged on the front section of the outer cylinder of the steam turbine cylinder body, a fourth pressure reducing pore plate is arranged on the lowest side of a flow passage in the outer cylinder of the steam turbine cylinder body, two fifth pressure reducing pore plates are respectively arranged on the inner side of the outer cylinder of the steam.

2. The integrated marine turbine pressure relief device of claim 1, wherein: the first pore plate and the second pore plate are circular pore plates, the third pore plate is a rectangular pore plate, the fourth pore plate is a fan-ring-shaped pore plate, and the fifth pore plate is a pore plate in a space curved surface shape.

3. The integrated marine turbine pressure relief device of claim 1, wherein: pressure reducing holes are distributed on the first, second, third, fourth and fifth pore plates.

4. The integrated marine turbine pressure relief device of claim 1, wherein: and a third pore plate, a fourth pore plate, a fifth pore plate, a partition plate and a rib plate are respectively welded on the inner wall of the steam turbine cylinder body.

5. The integrated marine turbine pressure relief device of claim 1, wherein: and a second orifice plate is welded at the inlet of the cylinder body of the side exhaust of the steam turbine cylinder body.

6. The integrated marine turbine pressure relief device of claim 1, wherein: and after the first pore plate is installed and enters the inner side of the side exhaust inlet pipe of the steam turbine, the inlet pipe is connected with the inlet flange of the cylinder body of the steam turbine.