CN112303473A

CN112303473A - Internal leakage control device for drain valve of thermal power plant

Info

Publication number: CN112303473A
Application number: CN202011319058.4A
Authority: CN
Inventors: 付利民; 程瑞华; 邬江虎; 周桓; 钟铭
Original assignee: Huaneng Qinmei Ruijin Power Generation Co Ltd
Current assignee: Huaneng Qinmei Ruijin Power Generation Co Ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-02-02

Abstract

The invention discloses an internal leakage control device of a drain valve of a thermal power plant, which comprises a pipeline, a valve body and a balancing weight, wherein the right side of the pipeline is fixedly connected with the valve body, connecting pipes are fixedly connected below the valve body and the pipeline, an internal connecting pipe is movably arranged inside the connecting pipes, a sliding groove is formed in the internal connecting pipe, a movable block is movably arranged inside the sliding groove, a connecting rod is fixedly connected to the side surface of the movable block, a rotating rod is fixedly arranged on the side surface of the connecting rod, a connecting shaft is fixedly connected to the surface of the internal connecting pipe, a through hole is formed in the internal connecting pipe, a floating block is fixedly connected to the right side of the rotating rod, and an internal box is placed in the valve. This leak control device in drain valve of thermal power plant has reduced the system leakage, greatly reduced the valve and has washed away the leakage, under the prerequisite of guaranteeing hydrophobic safety, furthest reduces superheated steam's emission, energy saving and consumption reduction can adjust trigger condition according to the demand simultaneously.

Description

Internal leakage control device for drain valve of thermal power plant

Technical Field

The invention relates to the technical field of thermal power plants, in particular to an internal leakage control device for a drain valve of a thermal power plant.

Background

Thermal power plant drives the generator through the steam turbine and rotates to turn into the electric energy with mechanical energy, need use the trap among thermal power plant's the thermodynamic system, under the general condition, the opening and close of thermal power plant trap is controlled according to the settlement load of unit, close steam turbine body trap when the unit load rises to 10% rated load, otherwise, at the in-process of shutting down, open steam turbine body trap when falling to 10% rated load, although control mode is simple, nevertheless has following problem:

(1) during the period from the steam turbine to the unit load rising to 10% of rated load, as the temperature of main steam when the steam turbine allows the steam turbine to rush is required to be higher than the metal temperature of a cylinder by more than 50 ℃ and has superheat degree not less than 50 ℃ when the unit is started, no water exists in a main steam pipeline during the period, high-temperature high-pressure steam is discharged, so that the heat loss is increased, and the scouring damage of a drain valve is greatly increased;

(2) some current internal leakage control detection device are detecting, reach specific comdenstion water's volume usually to open the valve, be not convenient for adjust trigger condition according to the demand, the controllability is relatively poor.

We have therefore proposed an internal leakage control device for a steam trap of a thermal power plant in order to solve the problems set out above.

Disclosure of Invention

The invention aims to provide an internal leakage control device for a drain valve of a thermal power plant, which aims to solve the problems that the internal leakage control in the background art increases the heat loss, greatly increases the scouring damage of the drain valve and is inconvenient to adjust the triggering condition according to the requirement.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a leak controlling means in drain valve of thermal power plant, includes pipeline, valve body and balancing weight, the right side fixedly connected with valve body of pipeline, and the equal fixedly connected with connecting pipe in below of valve body and pipeline to the inside movable mounting of connecting pipe has the nipple, the spout has been seted up to the inside of nipple, and the inside movable mounting of spout has the movable block to the side fixedly connected with connecting rod of movable block, the fixed bull stick that is provided with in side of connecting rod, the fixed surface of nipple is connected with the connecting axle, and the inside of nipple has seted up the through-hole, the right side fixedly connected with of bull stick floats the piece, interior box has been placed to the inside of valve body, and the equal fixedly connected with connecting plate in the left and right sides of interior box, the inside groove has been seted up to the inside of valve body, the.

Preferably, the right side surface of the valve body is arc-shaped, and the circle center corresponding to the right side arc surface of the valve body is located on the central axis of the connecting shaft.

Preferably, the inner wall of the sliding groove and the outer wall of the movable block are mutually attached, and the sliding groove and the movable block are both arc-shaped.

Preferably, the movable block, the connecting rod, the rotating rod and the floating block are integrated, the rotating rod forms a rotating structure with the inner connecting pipe through the connecting shaft, and the horizontal center line of the inner connecting pipe is located above the horizontal center line of the through hole.

Preferably, the floating block is cylindrical, and the right side of the floating block is attached to the inner wall of the valve body.

Preferably, the outer wall of the connecting plate is attached to the inner wall of the inner groove, and the inner box and the valve body form a dismounting structure through the connecting plate and the inner groove.

Compared with the prior art, the invention has the beneficial effects that: this leak control device in thermal power plant's drain valve:

(1) the device adopts the method of controlling the opening and closing of the drain valve according to the superheat degree, can reduce the leakage of steam, reduce the scouring frequency of the drain valve and prolong the service life of the drain valve, and particularly adopts the difference between the steam temperature in a main steam pipeline at the side of a steam turbine and the steam temperature (close to saturation temperature) at the outlet of a steam-water separator of a once-through boiler for control. Namely, in the starting process of the unit, when the difference between the temperatures of the steam at two positions is more than 50-60 ℃, namely the steam has the superheat degree of about 50-60 ℃, the drain valve of the main steam pipeline is automatically closed, the number of valves can be optimized when the unit is used, a drain valve with higher parameters (the design pressure is more than or equal to 10 MPa) adopts a mode of connecting three valves of a manual valve, a primary pneumatic drain valve and a secondary pneumatic drain valve in series, under the normal condition, the manual valve and the primary pneumatic valve are in a full-open state, the secondary drain valve is opened and closed to participate in the drainage of the unit, a thermocouple is arranged behind the high-temperature drain valve to monitor the internal leakage of the drain valve and improve the temperature control capability, the opening and closing of the valves are controlled in time according to the change of the temperature, the leakage of the system is reduced, the scouring leakage of the valves is greatly reduced, the drainage of the superheated steam is furthest, the energy is saved, the consumption is reduced, the control mode, the valve arrangement and the like of the drain valve are optimized, the time for the drain of the steam pipeline to enter the drain flash tank can be greatly shortened, the steam to wash the drain valve is reduced, the service life of the drain valve is prolonged, and the safety and the reliability of the whole operation of the unit are improved;

(2) the sliding structure that is provided with movable block and spout and constitutes in the inside of device, can make the showy piece of cylinder float after the inside entering liquid of valve body to open the through-hole on the device, make steam can get into, promoted the practicality of device, the inside of device still is provided with interior box simultaneously, can come to adjust the space that the valve body the latter half can hold through interior box and balancing weight, thereby make the device can come to adjust trigger condition according to the demand, promoted the application scope of device.

Drawings

FIG. 1 is a schematic cross-sectional structural view of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 at A according to the present invention;

FIG. 3 is a schematic view of the structure of FIG. 1 at B according to the present invention;

FIG. 4 is a schematic view of the overall structure of the inner case of the present invention;

FIG. 5 is a side sectional view of the connecting tube of the present invention.

In the figure: 1. a pipeline; 2. a valve body; 3. a connecting pipe; 4. an inner connecting pipe; 5. a chute; 6. a movable block; 7. a connecting rod; 8. a rotating rod; 9. a connecting shaft; 10. a through hole; 11. a floating block; 12. an inner case; 13. a connecting plate; 14. an inner tank; 15. and a balancing weight.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, the present invention provides a technical solution: a heat-engine plant drain valve inner leakage control device comprises a pipeline 1, a valve body 2, a connecting pipe 3, an inner connecting pipe 4, a sliding groove 5, a movable block 6, a connecting rod 7, a rotating rod 8, a connecting shaft 9, a through hole 10, a floating block 11, an inner box 12, a connecting plate 13, an inner groove 14 and a balancing weight 15, wherein the right side of the pipeline 1 is fixedly connected with the valve body 2, the connecting pipe 3 is fixedly connected with the lower parts of the valve body 2 and the pipeline 1, the inner connecting pipe 4 is movably arranged in the connecting pipe 3, the sliding groove 5 is arranged in the inner connecting pipe 4, the movable block 6 is movably arranged in the sliding groove 5, the connecting rod 7 is fixedly connected with the side surface of the movable block 6, the rotating rod 8 is fixedly arranged on the side surface of the connecting rod 7, the connecting shaft 9 is fixedly connected with the surface of the inner connecting pipe 4, the through hole 10 is arranged in the inner connecting pipe 4, the floating, and the equal fixedly connected with connecting plate 13 of the left and right sides of interior box 12, the inside of valve body 2 has seted up inside groove 14, and balancing weight 15 has been placed to the inside of interior box 12.

The right side surface of the valve body 2 is arc-shaped, and the circle center corresponding to the right side arc surface of the valve body 2 is positioned on the central axis of the connecting shaft 9, so that the inner wall on the right side of the valve body 2 can be always attached to the floating block 11 on the device when the floating block rotates, and the practicability of the device is improved.

Laminating mutually between the inner wall of spout 5 and the outer wall of movable block 6, and spout 5 and movable block 6 are circular-arcly for the device can normally rotate, can guarantee holistic sealed through spout 5 and the movable block 6 of laminating mutually simultaneously, has promoted the result of use of device.

The movable block 6, the connecting rod 7, the rotating rod 8 and the floating block 11 are integrated, the rotating rod 8 and the inner connecting pipe 4 form a rotating structure through the connecting shaft 9, and the horizontal center line of the inner connecting pipe 4 is positioned above the horizontal center line of the through hole 10, so that the movable block 6 can be driven to move up and down through the rotation of the device.

The shape of the floating block 11 is a cylinder, and the right side of the floating block 11 is mutually attached to the inner wall of the valve body 2, so that the stability of the device in use is improved, and the purpose of triggering the switch valve by utilizing the characteristic matching rotating structure which can float in the floating block 11 can be realized.

Laminating mutually between the outer wall of connecting plate 13 and the inner wall of inside groove 14, interior box 12 passes through to constitute between connecting plate 13 and inside groove 14 and the valve body 2 and dismantles the mounting structure, can be through dismantling mounting structure and the inside balancing weight 15 of stacking of interior box 12 on the device, come to adjust the accommodation space of valve body 2 the latter half to the trigger condition of opening and closing through-hole 10 is adjusted, has promoted the practicality of device.

The working principle is as follows: when the internal leakage control device of the drain valve of the thermal power plant is used, as shown in figures 1-3 and 5, when the device is used, a pipeline 1, a valve body 2 and a connecting pipe 3 are lapped through bolts and nuts, liquid in the pipeline 1 enters the valve body 2 so as to enable a floating block 11 to float, in the floating process of the floating block 11, a rotating rod 8 rotates on an internal connecting pipe 4 through a connecting shaft 9, meanwhile, a movable block 6 and a connecting rod 7 slide in a sliding groove 5, the movable block 6 and the connecting rod 7 rotate anticlockwise to enable a through hole 10 to be opened, so that the connecting pipe 3 and the interior of the valve body 2 are communicated with each other, the device can adjust the condition of triggering the opening of the through hole 10 according to requirements, firstly, an internal box 12 is installed through a connecting plate 13, the connecting plate 13 is installed in an internal groove 14 (as shown in figure 4), and after the installation is completed, the size of the cavity part at the lower half part of the valve body 2 is adjusted by adding the balancing weight 15 into the inner box 12, so that the device can open the through hole 10 according to different liquid flows in the valve body 2;

the device can optimize the installation position of the drain valve when in use, when the heater drain flows through the drain valve, the heater drain is influenced by the throttling of the valve core, the drain after the valve is vaporized to cause the two-phase flow of water vapor, so that the pipe body is abraded and vibrated, and noise is generated.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a leak controlling means in thermal power plant's drain valve, includes pipeline (1), valve body (2) and balancing weight (15), its characterized in that: the right side of the pipeline (1) is fixedly connected with a valve body (2), the lower parts of the valve body (2) and the pipeline (1) are fixedly connected with a connecting pipe (3), an inner connecting pipe (4) is movably arranged in the connecting pipe (3), a sliding chute (5) is formed in the inner connecting pipe (4), a movable block (6) is movably arranged in the sliding chute (5), a connecting rod (7) is fixedly connected to the side surface of the movable block (6), a rotating rod (8) is fixedly arranged on the side surface of the connecting rod (7), a connecting shaft (9) is fixedly connected to the surface of the inner connecting pipe (4), a through hole (10) is formed in the inner connecting pipe (4), a floating block (11) is fixedly connected to the right side of the rotating rod (8), an inner box (12) is placed in the valve body (2), and connecting plates (13) are fixedly connected to the left side and the right side of the inner, an inner groove (14) is formed in the valve body (2), and a balancing weight (15) is placed in the inner box (12).

2. The internal leakage control device for the thermal power plant drain valve according to claim 1, characterized in that: the right side surface of the valve body (2) is arc-shaped, and the circle center corresponding to the right side arc surface of the valve body (2) is positioned on the central axis of the connecting shaft (9).

3. The internal leakage control device for the thermal power plant drain valve according to claim 1, characterized in that: the inner wall of the sliding groove (5) and the outer wall of the movable block (6) are mutually attached, and the sliding groove (5) and the movable block (6) are both arc-shaped.

4. The internal leakage control device for the thermal power plant drain valve according to claim 1, characterized in that: the movable block (6), the connecting rod (7), the rotating rod (8) and the floating block (11) are integrated, the rotating rod (8) forms a rotating structure with the inner connecting pipe (4) through the connecting shaft (9), and the horizontal center line of the inner connecting pipe (4) is positioned above the horizontal center line of the through hole (10).

5. The internal leakage control device for the thermal power plant drain valve according to claim 1, characterized in that: the floating block (11) is cylindrical, and the right side of the floating block (11) is mutually attached to the inner wall of the valve body (2).

6. The internal leakage control device for the thermal power plant drain valve according to claim 1, characterized in that: the outer wall of the connecting plate (13) is attached to the inner wall of the inner groove (14), and the inner box (12) and the valve body (2) form a dismounting structure through the connecting plate (13) and the inner groove (14).