CN210714792U

CN210714792U - Built-in dehumidification system of steam turbine

Info

Publication number: CN210714792U
Application number: CN201921899193.3U
Authority: CN
Inventors: 钱小东; 唐真和; 俞冠民; 陈健超; 张红议; 杨世华
Original assignee: Hangzhou Chinen Steam Turbine Power Co Ltd
Current assignee: Hangzhou Chinen Steam Turbine Power Co Ltd
Priority date: 2019-11-06
Filing date: 2019-11-06
Publication date: 2020-06-09
Anticipated expiration: 2029-11-06

Abstract

The utility model provides a dehumidification system in steam turbine built-in, includes cylinder, dehydrating unit, steam controlling means, the cylinder includes first semi-cylinder, lower semi-cylinder, dehydrating unit contains first semi-dehumidification device, second semi-dehumidification device, gland sealing ring, linkage hydrophobic means contains drain pipe, trap, steam controlling means contains steam balance pipeline, pressure transmitter one, pressure transmitter two, electrical control valve.

Description

Built-in dehumidification system of steam turbine

Technical Field

The utility model relates to a dehumidification device in the machine, concretely relates to dehumidification device in steam turbine machine.

Background

Modern industry is continuously developed, the living standard of people is continuously improved, and the consumption of electric energy is increasingly intensified. In order to reduce the influence of industrial development on the environment, the energy-saving and emission-reducing target is established, and the waste heat power generation technology is also applied to the industries of steel, cement, glass and the like. A large amount of saturated steam generated in industrial production is used for generating electricity, so that the cost is saved, and the atmospheric pollution is reduced. However, the dryness of the saturated steam is further reduced after the saturated steam works through the steam turbine, wet steam is formed, severe water erosion phenomenon can be caused to blades, the safe operation of the steam turbine is affected, and the service life of the steam turbine is greatly shortened.

At present, a domestic and foreign saturated steam turbine dehumidification method mainly comprises the steps of dehumidifying outside a middle machine and reheating after dehumidifying outside the middle machine, wherein steam is required to be firstly extracted from the steam turbine and then passes through an external steam-water separator and then enters the steam turbine, so that the steam-water system of the steam turbine is complex, the structure of a steam turbine body is complex, the steam loss is large, the efficiency is low, and the like.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a steam turbine internal dehumidifying apparatus capable of directly dehumidifying inside a steam turbine, which is provided to solve the above-mentioned disadvantages.

In order to achieve the purpose, the utility model discloses a dehumidification system in steam turbine machine, including cylinder, dehydrating unit, hydrophobic means, steam controlling means, the cylinder includes first half cylinder, second half cylinder, dehydrating unit contains first dehydrating unit, second dehydrating unit, gland sealing ring, linkage hydrophobic means contains drain pipe, trap, steam controlling means contains steam balance pipeline, pressure transmitter one, pressure transmitter two, electrical control valve.

A further scheme does, divide into a plurality of admission cavities through separating the muscle in the dehydrating unit, be equipped with the water catch bowl on first dehydrating unit, the lower dehydrating unit surface, be equipped with the installation spacer block in the water catch bowl, there is the backplate through the screw mounting on first dehydrating unit, the lower dehydrating unit surface, and water catch bowl, installation spacer block, backplate constitute a plurality of independent water collection cavities, be equipped with the aperture on the backplate, the characteristics of this kind of structure are, the aperture be used for dredging the separation moisture, avoid leaking too much steam simultaneously, the size in hole need be calculated through steam flow, steam quality and trompil quantity and reachs. The steam flow velocity when the throat of the dehumidification device is 40-70 m/s, and for a unit with high humidity and large steam flow, a large flow velocity is selected.

The further scheme is that the suspension device is diagonally arranged on the outer side of the lower half dehumidification device, the lower half dehumidification device is hung in the lower half cylinder through the suspension device, the pressing plate is arranged on the suspension device, and the upper half dehumidification device and the lower half dehumidification device form buckle cover connection through the pressing plate matched with the suspension device.

The further scheme is that the round-head key and the dehumidifying device are in interference fit, and the round-head key and the cylinder are in clearance fit.

The structure is characterized in that the installation position is ensured through the key group, the key group comprises a short key, a cylindrical key, a long key and a gland sealing ring pressing plate, the short key and the long key are used for ensuring the axial installation position of the dehumidifying device, the cylindrical key is used for ensuring the radial installation position of the dehumidifying device, and the gland sealing ring is installed through the gland sealing ring pressing plate.

The further proposal is that the horizontal middle planes of the upper half dehumidifying device and the lower half dehumidifying device are provided with bolt holes for hoisting.

The further proposal is that the dehumidification system can be used for saturated steam straight condensing turbines, extraction condensing turbines and complementary condensing turbines with the main steam pressure of 1.0MPa (a) to 5.0MPa (a).

The further proposal is that the cylinder is of a convex hull structure and is used for guiding water, and the bottom of the cylinder is provided with a water collecting tank for collecting water.

The further scheme does, drain pipe and steam balance pipe locate half cylinder bottom down, the trap is located on the drain pipe, the drain pipe is connected with the drain box, steam balance union coupling has the condenser, electric control valve and pressure transmitter two locate on the steam balance pipe, be equipped with pressure transmitter one before the dehydrating unit, the characteristics of this kind of structure are, through monitoring pressure transmitter one and the pressure difference between the transmitter two, the aperture of electric control valve on the regulation balance pipe, the pressure that lets dehydrating unit advance pressure and cylinder drain trap maintains certain pressure difference, can guarantee best dehumidification effect like this, be unlikely to again let too much steam leak to the condenser.

The utility model has the advantages of: this dehydrating unit adopts baffle formula and centrifugal catch water principle, radial admission, axial play vapour, hydrophobic structure in top, reaches the design velocity of flow through the convergent runner behind the steam entering dehydrating unit, forms centrifugal air current, and heavier hydrone gets into dehydrating unit's top basin through centrifugal force in, and steam is then lower because of grade back pressure, turns to the export and flows out, reaches catch water's effect. In order to achieve the best dehumidification effect, the dehumidification device needs to be arranged after the moving blade stage with the steam dryness of 88% -90%, and the steam dryness can be obtained through thermodynamic calculation. The main steam is 4.0MPa (a) -5.0 MPa (a) and the secondary high pressure saturated steam turbine can be provided with 2 dehumidifying devices to achieve the best dehumidifying effect.

Drawings

Fig. 1 is a radial cross-sectional view of the structure of the present invention.

Fig. 2 is a side cross-sectional view of the structure of the present invention.

Fig. 3 is a top view of the present invention.

Fig. 4 is a cross-sectional view of a horizontally split key set of the present invention.

Figure 5 is a cross-sectional view of the suspension pin and pressure plate arrangement of the present invention.

Fig. 6 is a system diagram of the present invention.

FIG. 7 is a schematic longitudinal sectional view of a steam turbine according to an embodiment of the present invention.

In the above figures, 1-the upper half of the cylinder; 2-the upper half of the dehumidification device; 3-steam seal ring; 4-the lower half of the dehumidification device; 5-the lower half of the cylinder; 6-round head bond; 7-steam balance pipe; 8-a drain pipe; 9-installing a spacer block; 10-guard plate 18-transmitter II; 11-a suspension device; 12-short bond; 13-a cylindrical bond; 14-long bond; 15-steam seal ring pressing plate; 16-a platen; 17-a first transmitter; 18-pressure transmitter two; 19-an electric regulating valve; 20-a trap; 21-a drain tank; 22-condenser.

Detailed Description

The invention is further described by the following embodiments in conjunction with the accompanying drawings.

Example 1

As shown in fig. 1 to 7, the internal dehumidification system of the steam turbine described in this embodiment includes a cylinder, a dehumidification device, a water drainage device, and a steam control device, and is characterized in that the cylinder includes an upper half cylinder 1 and a lower half cylinder 5, the dehumidification device includes an upper half dehumidification device 2, a lower half dehumidification device 4, a gland sealing ring 3, a suspension device 11, the water drainage device includes a water drainage pipe 8 and a water drainage valve 20, and the steam control device includes a steam balancing pipe 7, a first pressure transmitter 17, a second pressure transmitter 18, and an electric control valve 19.

As shown in fig. 3 and 7, the interior of the dehumidifying device is divided into a plurality of steam inlet chambers by partition ribs, water collecting grooves are formed in the outer surfaces of the upper half dehumidifying device 2 and the lower half dehumidifying device 4, mounting partition blocks 9 are arranged in the water collecting grooves, guard plates 10 are mounted on the outer surfaces of the upper half dehumidifying device 2 and the lower half dehumidifying device 4 through screws, the water collecting grooves, the mounting partition blocks and the guard plates form a plurality of independent water collecting chambers, and small holes are formed in the guard plates.

As shown in fig. 5, the suspension device is diagonally arranged outside the lower half dehumidification device 4, the lower half dehumidification device 4 is suspended in the lower half cylinder 5 through the suspension device, the pressure plate 16 is arranged on the suspension device, and the upper half dehumidification device 2 is in snap-cap connection with the lower half dehumidification device 4 through the pressure plate 16 in cooperation with the suspension device.

As shown in fig. 1 to 2, a round-head key 6 is arranged at the bottom of the dehumidifying device 4, the round-head key 6 and the dehumidifying device are in interference fit, and the round-head key 6 and the cylinder are in clearance fit.

As shown in fig. 2 and 4, a key set is arranged on the horizontal mid-split plane of the upper half dehumidifying device 2 and the lower half dehumidifying device 4, and the key set includes a short key 12, a cylindrical key 13, a long key (14) and a gland ring pressure plate 15.

And bolt holes for hoisting are arranged on the horizontal midsplit surfaces of the upper half dehumidifying device 2 and the lower half dehumidifying device 4.

The dehumidification system can be used for saturated steam straight condensing turbines, extraction condensing turbines and complementary condensing turbines with main steam pressure of 1.0MPa (a) to 5.0MPa (a).

As shown in fig. 7, the cylinder is of a convex hull structure, and a water collection tank is arranged at the bottom of the cylinder.

As shown in fig. 6, drain pipe (8) and steam balance pipe (7) are located half cylinder (5) bottom down, drain valve (20) is located on drain pipe (8), drain pipe (8) are connected with drain box (21), steam balance pipe (7) are connected with condenser (22), electric control valve (19) and pressure transmitter two (18) are located on steam balance pipe (7), be equipped with pressure transmitter (17) before the dehydrating unit.

Claims

1. The utility model provides a dehumidification system in steam turbine machine, includes cylinder, dehydrating unit, steam control device, its characterized in that, the cylinder includes first semi-cylinder (1), lower semi-cylinder (5), dehydrating unit contains first semi-dehumidification device (2), second semi-dehumidification device (4), gland sealing ring (3), linkage (11) hydrophobic device contains drain pipe (8), trap (20), steam control device contains steam balance pipeline (7), pressure transmitter (17), pressure transmitter two (18), electrical control valve (19).

2. The built-in dehumidification system of a steam turbine according to claim 1, wherein the dehumidification device is divided into a plurality of steam inlet chambers through partition ribs, water collection grooves are formed in the outer surfaces of the upper half dehumidification device (2) and the lower half dehumidification device (4), mounting partition blocks (9) are arranged in the water collection grooves, guard plates (10) are mounted on the outer surfaces of the upper half dehumidification device (2) and the lower half dehumidification device (4) through screws, the water collection grooves, the mounting partition blocks and the guard plates form a plurality of independent water collection chambers, and small holes are formed in the guard plates.

3. The built-in dehumidification system of a steam turbine according to claim 1, wherein the suspension device is diagonally arranged outside the lower half dehumidification device (4), the lower half dehumidification device (4) is suspended in the lower half cylinder (5) through the suspension device, a pressing plate (16) is arranged on the suspension device, and the upper half dehumidification device (2) is in snap-cover connection with the lower half dehumidification device (4) through the pressing plate (16) in cooperation with the suspension device.

4. The built-in dehumidification system of the steam turbine according to claim 1, wherein a round-head key (6) is arranged at the bottom of the dehumidification device (4), the round-head key (6) is in interference fit with the dehumidification device, and the round-head key (6) is in clearance fit with a cylinder.

5. The in-turbine dehumidification system of the steam turbine according to claim 1, wherein a key set is arranged on a horizontal mid-split plane of the upper half dehumidification device (2) and the lower half dehumidification device (4), and the key set comprises a short key (12), a cylindrical key (13), a long key (14) and a gland sealing ring pressing plate (15).

6. The in-turbine steam turbine dehumidification system of claim 1, wherein the horizontal midsplit surfaces of the upper half dehumidification device (2) and the lower half dehumidification device (4) are provided with bolt holes for hoisting.

7. The in-turbine dehumidification system of claim 1, wherein the dehumidification system is applicable to saturated steam straight condensing turbines, extraction condensing turbines, and complementary condensing turbines with main steam pressure of 1.0mpa (a) to 5.0mpa (a).

8. The built-in dehumidifier system according to claim 1, wherein said cylinder has a convex hull structure, and a water collection tank is provided at a bottom of the cylinder.

9. The built-in dehumidification system of the steam turbine according to claim 1, wherein the drain pipe (8) and the steam balance pipe (7) are arranged at the bottom of the lower half cylinder (5), the drain valve (20) is arranged on the drain pipe (8), the drain pipe (8) is connected with a drain box (21), the steam balance pipe (7) is connected with a condenser (22), the electric control valve (19) and the pressure transmitter (18) are arranged on the steam balance pipe (7), and a first pressure transmitter (17) is arranged in front of the dehumidification device.