CN111991925B

CN111991925B - Rotary vane separator with inclined drainage groove

Info

Publication number: CN111991925B
Application number: CN202010802964.3A
Authority: CN
Inventors: 康芮琦; 欧阳硕; 王泽隆; 胡尧锟; 郭婕; 熊珍琴
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2020-08-11
Filing date: 2020-08-11
Publication date: 2022-03-15
Anticipated expiration: 2040-08-11
Also published as: CN111991925A

Abstract

The invention provides a rotary vane separator with an inclined drainage groove, which comprises an outer cylinder and an inner cylinder, wherein one end of the inner cylinder is arranged in the outer cylinder, and the other end of the inner cylinder extends to the outside of the outer cylinder. The inner cylinder includes entry development section and inner cylinder ascending section, install the rotary vane in the entry development section, a plurality of hydrophobic holes have been arranged along circumference to the inner cylinder ascending section. The drainage holes are inclined drainage grooves with wide lower parts and narrow upper parts, and the inclined drainage grooves are arranged in a radial inclined mode. The invention has the advantages that the flow cross section of the drainage hole can adapt to the trend that the liquid phase gradually diffused to the wall surface at the downstream of the rotary vane gradually reduces along with the height, the entrainment of steam to liquid drops is reduced, the separation efficiency of the rotary vane separator is improved, and the pressure drop of the inner cylinder is reduced.

Description

Rotary vane separator with inclined drainage groove

Technical Field

The invention relates to the field of steam-water separation of nuclear power stations, in particular to a rotary vane separator with an inclined drainage groove.

Background

A pressurized water reactor nuclear power plant is divided into two closed circuits. And the primary loop is a nuclear island and is used for converting nuclear energy into heat energy. The two loops are conventional islands, and the coolant in the two loops exchanges heat with the first loop to generate steam to drive a steam turbine to generate electricity. Wherein, the steam generator is the boundary of the first loop and the second loop of the pressurized water reactor. The single-phase liquid water in the primary loop exchanges heat with the circulating water in the secondary loop through a U-shaped pipe in the steam generator, the coolant in the secondary loop is separated by a steam-water separator after obtaining heat, part of steam enters a steam turbine to generate power, and the other part of liquid water continuously exchanges heat.

The steam-water separator is an important device of a secondary loop of the nuclear power station, the secondary loop exchanges heat with a primary loop system through a steam generator to obtain steam, the humidity of the steam directly influences the quality of the steam, and wet steam passes through the steam-water separator to separate most of liquid phase and then enters a steam turbine to do work. The saturated steam generated by the steam generator is usually a high-speed wet steam flow carrying a large amount of liquid droplets, and the untreated wet steam flow can cause impact wear to the turbine blades, so that salt is accumulated on the through-flow part of the turbine and the superheater pipeline, and the efficiency and the reliability of the turbine are reduced. Therefore, a steam-water separator is generally arranged in the steam generator to remove liquid drops from the steam, so that the power generation efficiency of the nuclear power station and the safety performance of the steam turbine are guaranteed.

Steam-water separators in steam generators are generally composed of three parts, centrifugal separation (centrifugal rotary vane separator), gravity separation (space between rotary vane separator and dryer), and secondary separation (corrugated plate separation). Among them, the rotary vane separator takes over 80% of the wet steam droplet separation task, so the separation efficiency of the rotary vane separator has a great influence on the steam quality in the two circuits. The liquid drops of the gas-liquid mixture in the rotary vane separator migrate to the wall surface under the action of the rotary vanes, the gas is gathered at the central position of the flow channel, the liquid drops are gathered on the wall surface to gradually form a liquid film, and the liquid film is easy to break under the action of the gas after reaching a larger thickness, so that secondary liquid drops are entrained to influence the separation effect.

Disclosure of Invention

In view of the shortcomings of the prior art, it is an object of the present invention to provide a rotating vane separator with inclined hydrophobic slots.

The invention provides a rotary vane separator with an inclined drainage groove, which comprises an outer cylinder and an inner cylinder, wherein one end of the inner cylinder is arranged in the outer cylinder, and the other end of the inner cylinder extends to the outside of the outer cylinder;

the inner barrel comprises an inlet development section and an inner barrel ascending section;

the inlet development section is internally provided with a rotary vane, and the inner cylinder rising section is circumferentially provided with a plurality of drainage holes;

the outer part of the inner cylinder ascending section is provided with a descending channel, the drain hole is communicated with the descending channel, and the top of the inner cylinder ascending section is connected with the descending channel through a side water outlet.

Preferably, a fixed partition plate is arranged inside the outer cylinder;

the outer cylinder is divided into a first accommodating space and a second accommodating space by the fixed partition plate.

Preferably, the water-saving device further comprises a lower outer cylinder drainage channel and an upper outer cylinder drainage channel; the descending channel is arranged in the first accommodating space, and the upper outer barrel drainage channel is arranged in the second accommodating space and is connected with the first accommodating space through a fixed partition plate;

the lower outer tub drainage passage is installed outside the outer tub and communicates with the second receiving space.

Preferably, an inner cylinder throttling ring is arranged at the top of the inner cylinder ascending section, and a side water outlet is formed between the inner cylinder throttling ring and the inner cylinder ascending section.

Preferably, the drainage hole adopts an inclined drainage groove, and the inclined drainage groove and the rotary vane are inclined in the same direction.

Preferably, the inclined drainage grooves are radially and obliquely arranged, and the inclined drainage grooves form an included angle of 30 degrees with the normal direction of the wall surface of the inner cylinder.

Preferably, the inclined drainage groove gradually narrows along the axial upward direction of the inner barrel, and a drainage groove flow passage on the inclined drainage groove is of a structure with a wide lower part and a narrow upper part.

Preferably, the inclined drainage grooves are uniformly arranged along the circumferential direction of the inner barrel.

Preferably, the air guide device further comprises an outer cylinder air guide channel, the outer cylinder air guide channel is installed on the fixed partition plate, and the outer cylinder air guide channel is used for communicating the first accommodating space with the second accommodating space.

Preferably, a plurality of blades are arranged on the rotary vane, and the plurality of blades are uniformly arranged along the circumferential direction of the rotary vane.

Compared with the prior art, the invention has the following beneficial effects:

the flow cross section of the drain hole can adapt to the trend that the liquid phase diffused to the wall surface at the downstream of the rotary vane gradually reduces along with the height, can ensure that a large amount of liquid films formed by wall surface aggregation are discharged in time in a lower area above the outlet of the rotary vane, simultaneously reduces the area of the drain hole in a higher area, reduces the steam flowing from the drain hole, thereby reducing the entrainment of the steam to liquid drops, improving the separation efficiency of the rotary vane separator and reducing the pressure drop of the inner cylinder.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a view showing an overall structure of a vane separator according to the present invention;

FIG. 2 is an enlarged view of a portion of area A of FIG. 1;

FIG. 3 is a schematic plan view of an inclined hydrophobic tank according to the present invention;

FIG. 4 is a schematic front view of the inclined drainage channel of the present invention;

FIG. 5 is a schematic view of the structure of FIG. 4 taken along the dashed line;

FIG. 6 is a schematic top view of the cross-section of the inner barrel showing the inclined drainage channels.

The figures show that:

inclined drainage groove 13 of descending channel 7 of inlet development section 1

The second containing space 8 of the rotary vane 2 is provided with a hydrophobic space 14

First accommodation space 9 fixing partition 15 of inner barrel ascending section 3

Drainage hole 4 lower outer cylinder drainage channel 10 drainage channel 16

Side drain port 5 upper outer cylinder drain channel 11 outer cylinder 100

Inner cylinder throttling ring 6 outer cylinder air guide channel 12 and inner cylinder 200

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

The invention provides a rotary vane separator with an inclined hydrophobic groove, which has the advantages of less carrying under steam, less liquid drop entrainment, improved separation efficiency and reduced pressure drop. As shown in fig. 1 and 2, the outer barrel 100 and the inner barrel 200 are included, one end of the inner barrel 200 is installed inside the outer barrel 100, the other end of the inner barrel 200 extends to the outside of the outer barrel 100, as shown in fig. 6, a drainage channel 16 is formed inside the inner barrel 200, the inner barrel 200 includes an inlet development section 1 and an inner barrel ascending section 3, a rotary vane 2 is installed in the inlet development section 1, and a plurality of drainage holes 4 are circumferentially arranged on the inner barrel ascending section 3; a descending channel 7 is arranged outside the inner cylinder ascending section 3, the drain hole 4 is communicated with the descending channel 7, and the top of the inner cylinder ascending section 3 is connected with the descending channel 7 through a side water outlet 5. The flow cross section of the drain hole can adapt to the trend that the liquid phase which is gradually diffused to the wall surface at the downstream of the rotary vane gradually reduces along with the height, can ensure that a large amount of liquid films formed by wall surface aggregation are discharged in time in a lower area above the outlet of the rotary vane, simultaneously reduces the area of the drain hole in a higher area, reduces the steam which flows from the drain hole, thereby reducing the entrainment of the steam to liquid drops, improving the separation efficiency of the rotary vane separator, and simultaneously reducing the pressure drop of the inner cylinder.

Specifically, as shown in fig. 1, the present invention further includes a lower outer cylinder drainage channel 10 and an upper outer cylinder drainage channel 11, the lower outer cylinder drainage channel 10 is used for guiding out water discharged from the descending channel 7, and a fixed partition 15 is arranged inside the outer cylinder 100; the fixed partition 15 divides the outer tub 100 into a first accommodation space 9 and a second accommodation space 8; the descending channel 7 is arranged in the first accommodating space 9, and the upper outer cylinder drainage channel 11 is arranged in the second accommodating space 8 and is connected with the first accommodating space 9 through a fixed partition 15; the lower outer tub drain passage 10 is installed outside the outer tub 100 and communicates with the second receiving space 8.

The upper part and the lower part of the outer cylinder 100 are separated by a fixed clapboard 15, the water discharge of the two parts is collected through a lower outer cylinder water discharge channel 10 and an upper outer cylinder water discharge channel 11, and a flow meter can be arranged on the water discharge channel to count the water discharge of each part. Meanwhile, in the experiment, all the drain holes of the outer barrel 100 are always in a liquid seal state, the outer barrel 100 is communicated through the outer barrel air guide channel 12 to keep the pressure in the outer barrel 100 stable, and meanwhile, the loss steam of the rotary vane separator can enter the upper outer barrel drainage channel 11 from the descending channel 7 and then is discharged from the outlet of the device, so that the steam quality is improved, the pressure drop of the inner barrel is reduced, the bypass flow of the steam is reduced, and the effect of improving the steam quality at the outlet of the steam-water separator is achieved.

Specifically, as shown in fig. 1, an inner tube throttling ring 6 is arranged at the top of the inner tube rising section 3 and used for guiding out inner tube steam, and a side water outlet 5 is formed between the inner tube throttling ring 6 and the inner tube rising section 3.

Specifically, as shown in fig. 1, the drainage hole 4 is an inclined drainage groove 13, the lower part of the inclined drainage groove 13 is wide, and the upper part of the inclined drainage groove 13 is narrow, and the inner space of the inclined drainage groove 13 forms a drainage space 14. The inclined draining grooves 13 are inclined in the same direction as the blades of the rotary vane 2, and the inclined draining grooves 13 and the axial direction of the inner barrel 200 form an included angle of 30 degrees, as shown in fig. 3.

Further, the inclined drainage groove 13 is opened towards the direction of the descending channel 7, and the opening direction of the inclined drainage groove 13 forms an included angle of 30 degrees with the normal direction of the inner wall of the inner barrel ascending section 3, as shown in fig. 4. Compared with the traditional circular drainage hole, the inclined drainage groove with the wide lower part and the narrow upper part is adopted, so that the invention can be more suitable for the characteristics of more lower part and less higher area of separated water, the large area of the lower part is beneficial to discharging a large amount of separated water, a liquid film can not be accumulated continuously, and the entrainment of gas to liquid drops is reduced; the upper region has less separated water and the area of the hydrophobic groove is small, so that the separated water can be discharged, meanwhile, the overlarge area is avoided, gas circulates in the hydrophobic hole, and the carrying of steam is reduced.

Specifically, as shown in fig. 1 and 3, in a preferred embodiment, the inclined drainage grooves 13 are uniformly arranged along the circumferential direction of the inner cylinder 200.

Specifically, as shown in fig. 1, the steam turbine further comprises an outer cylinder air guide channel 12, the outer cylinder air guide channel 12 is mounted on the fixed partition 15 and communicates the first accommodating space 9 with the second accommodating space 8, the steam inside the inner cylinder rising section 3 is discharged through the inner cylinder throttling ring 6, and the outer cylinder air guide channel 12 communicates the first accommodating space 9 with the second accommodating space 8, so that the pressure of the outer cylinder 100 is maintained stable.

In the working process of the invention, a gas-liquid mixture fully develops after passing through the inlet development section 1 and passes through the area of the rotary vane 2, and the rotary vane 2 is provided with a rotary vane. The inclined drainage groove is positioned on the wall surface of the inner cylinder 200 above the rotary vane 2. The inclined drainage grooves 13 are uniformly distributed along the circumferential wall surface of the inner barrel 200, the specific structure of the drainage holes 4 is shown in fig. 3, the inclined direction of the inclined drainage grooves is in the same direction with the outlet of the rotary vane 2 and forms an inclination angle of 30 degrees with the axial direction of the inner barrel 200, the flow passage area of the inclined drainage grooves gradually narrows along the rising direction of the inner barrel 200, the inclined drainage grooves are opened towards the outlet of the descending channel 7 and form a hole with the normal direction of the inner barrel ascending section 3 inner wall, and a lateral drainage port 5 is arranged above the inclined drainage grooves and is used for discharging wall surface liquid films which are not guided out by the drainage holes 4 as shown in fig. 2. The outlet of the inner barrel ascending section 3 is provided with a throttling ring 6 for guiding out the steam in the inner barrel 200. At the bottom of the second receiving space 8 there is 10 a lower outer drum drainage channel for leading away water drained by the drop way. At the bottom of the first receiving space 9 there is an upper outer drum drainage channel 11 for draining away water accumulated in the first receiving space 9 under the action of gravity. An outer drum air guide channel 12 is arranged between the first accommodating space 9 and the second accommodating space 8 and is used for conveying the steam discharged from the descending channel 7 into the first accommodating space 9 and maintaining the pressure of the outer drum to be stable.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. The rotary vane separator with the inclined drainage groove is characterized by comprising an outer cylinder (100) and an inner cylinder (200), wherein one end of the inner cylinder (200) is arranged inside the outer cylinder (100), and the other end of the inner cylinder (200) extends to the outside of the outer cylinder (100);

the inner barrel (200) comprises an inlet development section (1) and an inner barrel ascent section (3);

the inlet development section (1) is internally provided with a rotary vane (2), and the inner cylinder ascending section (3) is circumferentially provided with a plurality of drainage holes (4);

a descending channel (7) is arranged outside the inner cylinder ascending section (3), the drain hole (4) is communicated with the descending channel (7), and the top of the inner cylinder ascending section (3) is connected with the descending channel (7) through a side water outlet (5);

a fixed clapboard (15) is arranged inside the outer cylinder (100);

the fixed partition plate (15) divides the outer cylinder (100) into a first accommodating space (9) and a second accommodating space (8);

an inner cylinder throttling ring (6) is arranged at the top of the inner cylinder rising section (3), and a side water outlet (5) is formed between the inner cylinder throttling ring (6) and the inner cylinder rising section (3);

the drainage holes (4) adopt inclined drainage grooves (13), and the inclined drainage grooves (13) have the same inclination direction with the rotary vanes (2);

the inclined drainage groove (13) is gradually narrowed along the upward direction of the axial direction of the inner cylinder (200), and a drainage groove flow passage on the inclined drainage groove (13) is of a structure with a wide lower part and a narrow upper part.

2. The rotary vane separator with inclined hydrophobic channel as claimed in claim 1, further comprising a lower outer cylinder drain channel (10) and an upper outer cylinder drain channel (11); the descending channel (7) is arranged in the first accommodating space (9), and the upper outer barrel drainage channel (11) is arranged in the second accommodating space (8) and is connected with the first accommodating space (9) through a fixed partition plate (15);

the lower outer tub drainage passage (10) is installed outside the outer tub (100) and communicates with the second accommodation space (8).

3. The rotating-vane separator with inclined hydrophobic grooves as claimed in claim 1, wherein the inclined hydrophobic grooves (13) are radially and obliquely arranged, and the inclined hydrophobic grooves (13) form an angle of 30 degrees with the normal direction of the wall surface of the inner drum (200).

4. The rotary vane separator with inclined hydrophobic grooves as claimed in claim 1, wherein the inclined hydrophobic grooves (13) are uniformly arranged along the circumferential direction of the inner drum (200).

5. The rotating-vane separator with inclined hydrophobic slot as claimed in claim 1, further comprising an outer-cylinder air guide channel (12), wherein the outer-cylinder air guide channel (12) is installed on the fixed partition (15) and the outer-cylinder air guide channel (12) communicates the first accommodating space (9) with the second accommodating space (8).

6. The rotating-vane separator with the inclined hydrophobic groove according to claim 1, characterized in that a plurality of vanes are arranged on the rotating vane (2), and the vanes are uniformly arranged along the circumference of the rotating vane (2).