CN215508187U

CN215508187U - Continuous flushing system for piston of plunger pump of nuclear power station

Info

Publication number: CN215508187U
Application number: CN202121324738.5U
Authority: CN
Inventors: 别文凯; 包泳珂; 刘丰
Original assignee: China General Nuclear Power Corp; China Nuclear Power Engineering Co Ltd; CGN Power Co Ltd
Current assignee: China General Nuclear Power Corp; China Nuclear Power Engineering Co Ltd; CGN Power Co Ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2022-01-14
Anticipated expiration: 2031-06-15

Abstract

The utility model discloses a continuous flushing system for a plunger pump piston of a nuclear power station, which comprises a first liquid inlet pipeline and at least one group of flushing devices, wherein the first liquid inlet pipeline is used for enabling flushing liquid to enter the continuous flushing system; the flushing device at least comprises a first pipeline and a second pipeline which are arranged in parallel; the first pipeline comprises a liquid storage tank for storing flushing liquid, and a first branch pipeline and a liquid outlet pipeline which are respectively communicated with the liquid storage tank; the second pipeline comprises a second branch line connected in parallel with the first branch line; the flushing device also comprises a flushing line for flushing the piston of the plunger pump; the flushing device further comprises a first isolation valve and a second isolation valve, the first isolation valve is arranged on the liquid outlet pipeline, and the second isolation valve is arranged on the second branch pipeline. By arranging the flushing device, the utility model can realize continuous flushing of the piston sealing surface of the plunger pump, prolong the service life of the plunger pump, reduce the maintenance cost, shorten the overhaul period of the unit, improve the reliability of the equipment and ensure the nuclear safety.

Description

Continuous flushing system for piston of plunger pump of nuclear power station

Technical Field

The utility model relates to the technical field of nuclear power station corollary equipment, in particular to a continuous flushing system for a nuclear power station plunger pump piston.

Background

At present, a plunger pump is widely applied to domestic and foreign nuclear power units, and a small amount of liquid needs to be leaked from a piston sealing surface of the plunger pump to ensure the lubrication and heat dissipation of the sealing surface in the running process of the plunger pump, so that the piston sealing surface has a certain leakage rate. The operating medium of the plunger pump is boric acid, the leaked boric acid is in contact with air, the moisture of the boric acid is slowly evaporated and gradually forms boric acid crystals to be attached to the sealing surface of the piston, the crystals and the sealing surface are repeatedly rubbed, so that the sealing surface is gradually abraded, and the leakage rate of the piston is increased. Before the existing sealing technology and sealing material are not technically changed, the piston needs to be disassembled for multiple times in a short period to replace a sealing surface, manpower and material resources are wasted, key nodes of a unit are influenced, and more importantly, the reliability of equipment is reduced, and nuclear safety is threatened.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a continuous flushing system for a plunger pump piston of a nuclear power station, aiming at the defects of the prior art.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

a continuous flushing system for a plunger pump piston of a nuclear power station comprises a first liquid inlet pipeline for enabling flushing liquid to enter the continuous flushing system, and at least one group of flushing devices communicated with the first liquid inlet pipeline;

the flushing device at least comprises a first pipeline and a second pipeline which are arranged in parallel;

the first pipeline comprises a liquid storage tank for storing the flushing liquid, and a first branch pipeline and a liquid outlet pipeline which are respectively communicated with the liquid storage tank, wherein one end of the first branch pipeline is communicated with the first liquid inlet pipeline;

the second conduit comprises a second branch line in parallel with the first branch line;

the flushing device also comprises a flushing pipeline for flushing the piston of the plunger pump, and the liquid outlet pipeline and the second branch pipeline are simultaneously communicated with the flushing pipeline;

the flushing device further comprises a first isolation valve and a second isolation valve, the first isolation valve is used for controlling the on-off of the first pipeline, the second isolation valve is used for controlling the on-off of the second pipeline, the first isolation valve is arranged on the liquid outlet pipeline, and the second isolation valve is arranged on the second branch pipeline.

Preferably, one end of the liquid outlet pipeline is communicated to the bottom of the liquid storage tank, and the other end of the liquid outlet pipeline is communicated with the flushing pipeline.

Preferably, a third isolation valve for controlling the on-off of the first branch pipeline is further arranged on the first branch pipeline.

Preferably, said continuous flushing system comprises at least two of said flushing devices connected in parallel to said first liquid inlet line;

each flushing device further comprises a second liquid inlet pipeline, one end of the second liquid inlet pipeline is communicated with the first liquid inlet pipeline, and the other end of the second liquid inlet pipeline is used for communicating the first pipeline with the second pipeline.

Preferably, a fourth isolating valve is further arranged on the second liquid inlet pipeline and used for controlling the second liquid inlet pipeline to be switched on and off.

Preferably, the continuous flushing system further comprises a flow regulating valve for controlling the flow rate of the liquid inlet, and the flow regulating valve is arranged on the first liquid inlet pipeline;

or the flow regulating valve is arranged on the second branch pipeline.

Preferably, a heating wire for heating the flushing liquid is further arranged on the first liquid inlet pipeline, and the flushing liquid enters the flushing device after being heated by the heating wire.

Preferably, the continuous flushing system further comprises a temperature switch for controlling whether the heating wire works or not;

when the heating wire is lower than the preset temperature, the temperature switch is turned on, and the heating wire starts to work;

and when the heating wire is higher than the preset temperature, the temperature switch is closed, and the heating wire stops working.

Preferably, when the flow regulating valve is arranged on the first liquid inlet pipeline, the flow regulating valve and the heating wire are sequentially arranged along the liquid inlet direction of the flushing liquid.

Preferably, the flushing liquid is desalted and dechlorinated water.

The utility model has the following beneficial effects: through setting up washing unit, can realize washing in succession the sealed face of plunger pump piston, can prolong the life-span of plunger pump, reduce cost of maintenance, shorten unit overhaul cycle, improve equipment reliability ensures nuclear safety, promotes the security quality simultaneously, reduces the human error risk.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

The continuous flushing system for the piston of the plunger pump of the nuclear power station is used for flushing the sealing surface of the piston of the plunger pump uninterruptedly, so that impurities are prevented from being accumulated on the sealing surface.

In particular, the present invention provides a continuous flushing system, and with reference to fig. 1, comprising a first inlet line 1 for feeding flushing liquid into the continuous flushing system, and at least one set of flushing devices 2 communicating with the first inlet line 1. In the utility model, the flushing liquid is preferably pressurized desalted and dechlorinated water existing in a power plant, namely the flushing liquid enters the first liquid inlet pipeline 1 at a certain flow rate. The flushing liquid enters the flushing device 2 through the first liquid inlet pipeline 1, and then the piston sealing surface of the plunger pump is flushed through the flushing device 2.

Further, the flushing device 2 comprises a first pipeline 21 and a second pipeline 22 which are arranged in parallel, and a flushing line 23 which is communicated with the first pipeline 21 and the second pipeline 22. The first pipeline 21 can store flushing liquid entering the flushing device 2 through the first liquid inlet pipeline 1, and the piston sealing surface is flushed by the stored flushing liquid when the flushing is needed; the second pipeline 22 is a direct flushing pipeline, that is, flushing liquid entering the first liquid inlet pipeline 1 can directly and continuously flush the sealing surface through the second pipeline 22, and the first pipeline 21 and the second pipeline 22 are simultaneously communicated with the flushing pipeline 23 and perform flushing work through the flushing pipeline 23. Further, the end of the flushing line 23 facing away from the first and second lines 21, 22 is connected to the piston bottom blanking hole for flushing the piston sealing surface.

In the present invention, the first pipeline 21 may specifically include a liquid storage tank 211, a first branch pipeline 212 and a liquid outlet pipeline 213, wherein the liquid storage tank 211 is used for storing a flushing liquid, and both the first branch pipeline 212 and the liquid outlet pipeline 213 are communicated with the liquid storage tank 211. In some embodiments, the outlet line 213 preferably communicates with the bottom of the reservoir 211 at one end and the flush line 23 at the other end, so that when continuous flushing is desired, the flushing liquid enters the flush line 23 through the outlet line 213 under the force of gravity, thereby performing the flushing operation.

Further, in order to control the liquid inlet and outlet of the liquid storage tank 211, it is preferable that a third isolation valve 215 is provided on the first branch line 212, and is used for controlling the on-off of the first branch line 212, so as to control whether the liquid storage tank 211 is filled with liquid; a first isolation valve 214 is further disposed on the liquid outlet line 213 for controlling the on/off of the liquid outlet line 213, so as to control whether the flushing device 2 performs continuous flushing operation through the first pipeline 21. So that when the third isolation valve 215 is opened and the first isolation valve 214 is closed, the water storage operation to the tank 211 is started; when the first isolation valve 214 is opened, the flushing liquid in the tank 211 flows downward by gravity, thereby performing a flushing operation.

The second pipeline 22 includes a second branch pipeline 221, and when the piston sealing surface of the plunger pump is continuously flushed through the second branch pipeline 221, the flushing liquid enters the second branch pipeline 221 through the first liquid inlet pipeline 1 and directly enters the liquid outlet pipeline 213 through the second branch pipeline 221, so as to flush the piston sealing surface. Further, a second isolation valve 222 is disposed on the second branch line 221 for controlling the on/off of the second branch line 221, so as to control whether to perform continuous flushing operation through the second pipeline 22.

In some embodiments, in order to enable the second pipeline 22 to perform the function of adjustable pressurized flushing, a flow regulating valve 3 may be further disposed on the first liquid inlet pipeline 1 or the second branch pipeline 221, and the flushing flow rate to the piston sealing surface is further adjusted by controlling the opening degree of the flow regulating valve 3, so as to achieve adjustable pressurized flushing. In the present invention, it is preferable that the flow rate regulating valve 3 is provided on the first liquid inlet line 1 for the convenience of the worker.

In the present invention, the first pipeline 21 and the second pipeline 22 may be put into the flushing operation at the same time or alternatively used, which is not limited herein.

Further, the continuous flushing system provided by the present invention may include one set of the above-mentioned flushing devices 2, and may also include a plurality of sets of the flushing devices 2. When the continuous flushing system comprises only one set of flushing devices 2, the first pipeline 21 and the second pipeline 22 can be directly connected in parallel at one end of the first liquid inlet pipeline 1; when the continuous flushing system comprises a plurality of groups of flushing devices 2, preferably, a second liquid inlet pipeline 24 is also arranged in front of each group of flushing devices 2 in a communicated manner and is connected to the same end of the first liquid inlet pipeline 1 in parallel through a plurality of second liquid inlet pipelines 24, so that flushing liquid is divided through the second liquid inlet pipelines 24 and then enters a plurality of groups of flushing devices 2. Further, each second liquid inlet pipeline 24 is further provided with a fourth isolating valve 241, which is used for controlling the on-off of the second liquid inlet pipeline 24, so as to control whether the flushing device 2 corresponding to the second liquid inlet pipeline 24 is put into flushing operation. As a specific embodiment, the continuous flushing system includes three sets of flushing devices 2, and a second liquid inlet line 24 is communicated in front of each set of flushing device 2, that is, the first pipeline 21 and the second pipeline 22 are connected in parallel on the second liquid inlet line 24; three second liquid inlet lines 24 are connected in parallel at one end of the first liquid inlet line 1, and in some embodiments, three sets of flushing devices 2 can be used simultaneously; in other embodiments, the three groups of flushing devices 2 may be further divided into a working group and a standby group by opening and closing the fourth isolation valve 241, when the working group normally works, the fourth isolation valve 241 corresponding to the working group is in an open state, the fourth isolation valve 241 corresponding to the standby group is in a closed state, and when the working group fails to complete the flushing work, the fourth isolation valve 241 corresponding to the standby group is opened to replace the working group, and then the flushing work is performed.

Furthermore, since the high-temperature water can perform the washing and cleaning work more efficiently, in order to further improve the washing efficiency, a heating wire 41 for heating the washing liquid may be further provided on the first liquid inlet line 1, and the washing liquid heated by the heating wire 41 is then introduced into the washing apparatus 2. In some embodiments, the continuous flushing system further comprises a temperature switch 42 for controlling whether the heating wire 41 is operated, and the temperature switch 42 can be set to a preset temperature value, in this embodiment, the temperature switch 42 can be a switch capable of automatically detecting the temperature of the heating wire 41 and controlling the opening and closing of the heating wire 41 by recognizing the temperature of the heating wire 41 in the prior art. Specifically, when the temperature of the heating wire 41 is lower than the preset temperature, the temperature switch 42 is turned on, and at this time, the heating wire 41 starts to work; when the temperature of the heating wire 41 is higher than the preset temperature, the temperature switch 42 is turned off to stop the heating wire 41, so as to avoid the excessive temperature of the washing liquid, which causes energy waste or equipment damage.

Further, when flow control valve 3 was located on first feed liquor pipeline 1, preferred flow control valve 3 and heater strip 41 set gradually along the feed liquor direction of washing liquid, and after flow control valve 3 adjusted the washing flow promptly, washing liquid rose the temperature through heater strip 41, got into a set of or multiunit washing unit 2 afterwards, washed the work.

According to the continuous flushing system provided by the utility model, the first pipeline 21 and the second pipeline 22 are arranged, so that the function of continuously flushing the sealing surface of the piston can be realized, the impurities are prevented from being accumulated on the surface of the sealing surface of the piston, the service life of the plunger pump is effectively prolonged, and the cost of manpower and material resources is saved.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A continuous flushing system for a plunger pump piston of a nuclear power plant, which is characterized by comprising a first liquid inlet pipeline (1) for enabling flushing liquid to enter the continuous flushing system, and at least one group of flushing devices (2) communicated with the first liquid inlet pipeline (1);

the flushing device (2) at least comprises a first pipeline (21) and a second pipeline (22) which are arranged in parallel;

the first pipeline (21) comprises a liquid storage tank (211) used for storing the flushing liquid, and a first branch pipeline (212) and a liquid outlet pipeline (213) which are respectively communicated with the liquid storage tank (211), wherein one end of the first branch pipeline (212) is communicated with the first liquid inlet pipeline (1);

the second circuit (22) comprises a second branch line (221) in parallel with the first branch line (212);

the flushing device (2) further comprises a flushing pipeline (23) for flushing a piston of the plunger pump, and the liquid outlet pipeline (213) and the second branch pipeline (221) are communicated with the flushing pipeline (23) at the same time;

the flushing device (2) further comprises a first isolation valve (214) used for controlling the on-off of the first pipeline (21) and a second isolation valve (222) used for controlling the on-off of the second pipeline (22), the first isolation valve (214) is arranged on the liquid outlet pipeline (213), and the second isolation valve (222) is arranged on the second branch pipeline (221).

2. The nuclear power plant plunger pump piston continuous flushing system of claim 1, characterized in that the liquid outlet line (213) communicates with the bottom of the reservoir (211) at one end and with the flushing line (23) at the other end.

3. The continuous flushing system of nuclear power plant plunger pump pistons as claimed in claim 2, characterized in that a third isolation valve (215) for controlling the on-off of the first branch line (212) is further provided on the first branch line (212).

4. The continuous flushing system of nuclear power plant plunger pump pistons according to claim 1, characterized in that it comprises at least two of the flushing devices (2) connected in parallel on the first liquid inlet line (1);

each flushing device (2) further comprises a second liquid inlet pipeline (24), one end of the second liquid inlet pipeline (24) is communicated with the first liquid inlet pipeline (1), and the other end of the second liquid inlet pipeline is used for communicating the first pipeline (21) with the second pipeline (22).

5. The continuous flushing system of the plunger pump piston in the nuclear power plant as claimed in claim 4, characterized in that a fourth isolating valve (241) is further arranged on the second liquid inlet line (24) and used for controlling the on-off of the second liquid inlet line (24).

6. The continuous flushing system of plunger pump pistons in nuclear power plants according to claim 1, characterized in that it further comprises a flow regulating valve (3) for controlling the inlet liquid flow, said flow regulating valve (3) being provided on said first inlet liquid line (1);

or, the flow regulating valve (3) is arranged on the second branch pipeline (221).

7. The continuous flushing system for the piston of the plunger pump in the nuclear power plant as claimed in claim 6, characterized in that a heating wire (41) for heating the flushing liquid is further arranged on the first liquid inlet pipeline (1), and the flushing liquid enters the flushing device (2) after being heated by the heating wire (41).

8. The nuclear power plant plunger pump piston continuous flushing system of claim 7, characterized in that it further comprises a temperature switch (42) for controlling the operation or non-operation of the heating wire (41);

when the heating wire (41) is lower than the preset temperature, the temperature switch (42) is opened, and the heating wire (41) starts to work;

when the heating wire (41) is higher than the preset temperature, the temperature switch (42) is closed, and the heating wire (41) stops working.

9. The continuous flushing system of nuclear power plant plunger pump pistons according to claim 8, characterized in that when the flow regulating valve (3) is provided on the first liquid inlet line (1), the flow regulating valve and the heating wire (41) are arranged in sequence along the liquid inlet direction of the flushing liquid.

10. The continuous flushing system of nuclear power plant plunger pump pistons as claimed in claim 1, characterized in that the flushing liquid is demineralized and dechlorinated water.