CN217361139U

CN217361139U - Main steam pipeline leakage monitoring system based on flow measurement

Info

Publication number: CN217361139U
Application number: CN202220249133.2U
Authority: CN
Inventors: 张程; 夏栓; 牛婷婷; 江浩; 张翔云; 董世昕; 武心壮; 蔡友强
Original assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Current assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Priority date: 2022-01-30
Filing date: 2022-01-30
Publication date: 2022-09-02
Anticipated expiration: 2032-01-30

Abstract

The utility model relates to a nuclear power plant monitoring technology field specifically discloses a main steam conduit leakage monitoring system based on flow measurement, including flow probe, steam conduit and signal processing center, flow probe, steam conduit's the outside is provided with the heat preservation, the level is provided with flow probe between steam conduit and the heat preservation, flow probe is the hot line anemoscope probe structure who has the hotfilm probe, flow probe is connected with the signal processing center through the cable. The monitoring system can realize direct monitoring of multiple measuring points of the gaseous leakage steam in the containment environment, and the maintenance cost is low after installation because the hot film probe can work in a severe flow field; the monitoring system realizes higher detection sensitivity and faster response time for the leakage of the main steam pipeline, remarkably improves the reaction speed after the leakage is found, and provides a larger safety margin; the monitoring system varies the measurement results from different flow probes.

Description

Main steam pipeline leakage monitoring system based on flow measurement

Technical Field

The utility model relates to a nuclear power plant monitoring technology field specifically is a main steam pipeline leakage monitoring system based on flow measurement.

Background

The application of the LBB (break-before-leak) criterion for the main steam pipeline in the design of a nuclear power plant requires that the nuclear power plant has a high pipeline leakage monitoring capability. The leakage monitoring system can be used for effectively finding the leakage of the pipeline in time and taking corresponding treatment measures within enough time, so that large crevasses caused by further expansion of pipeline cracks are avoided, and the main steam pipeline leakage monitoring requirement has positioning and quantifying capabilities.

The main steam pipeline leakage monitoring technology commonly applied in the design of the nuclear power plant at present has long response time such as containment pit liquid level measurement and the like and poor positioning and quantification precision, so a leakage monitoring system needs to be added on the main steam pipeline using the LBB technology to meet the LBB requirement and realize the diversity of the monitoring method.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a main steam line leakage monitoring system based on flow measurement for real-time supervision main steam line's stress variation, and accurate finding out the leakage point fast and confirm the leakage quantity after the pipeline takes place to leak, thereby guarantee nuclear power plant's safe operation, with the problem of proposing in solving above-mentioned background art.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a main steam pipeline leakage monitoring system based on flow measurement, includes flow probe, steam conduit and signal processing center, flow probe, steam conduit's the outside is provided with the heat preservation, the level is provided with flow probe between steam conduit and the heat preservation, flow probe is the hot wire anemoscope probe structure who has the hotfilm probe, flow probe is connected with the signal processing center through the cable.

Preferably, the probe head of the flow probe is in a quartz body structure or a glass rod structure with a metal film sprayed.

Compared with the prior art, the beneficial effects of the utility model are that: the monitoring system can realize direct monitoring of multiple measuring points of the gaseous leakage steam in the containment environment, and the maintenance cost is low after installation because the hot film probe can work in a severe flow field; the monitoring system realizes higher detection sensitivity and faster response time for the leakage of the main steam pipeline, obviously improves the reaction speed after the leakage is found, and provides larger safety margin; the monitoring system can determine the leakage amount and the leakage position through the measurement result difference of different flow probes, judge the structural damage of the main steam pipeline in the crack propagation stage of the pipeline and give an early warning before the main steam pipeline leaks; the monitoring system is additionally provided with relevant equipment such as a flow probe, a signal processing center and the like, has mature operation design experience, is convenient to operate and manufacture, and does not influence the realization of the normal functions of the first loop and the second loop of the nuclear power station.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an overall side view of the present invention;

fig. 3 is an overall sectional view of the present invention;

fig. 4 is an enlarged schematic view of a in fig. 3.

In the figure: 1. a flow probe; 2. a steam line; 3. a heat-insulating layer; 4. and a signal processing center.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1-4, the present invention provides a technical solution: the utility model provides a main steam pipeline leakage monitoring system based on flow measurement, includes flow probe 1, steam conduit 2 and signal processing center 4, and flow probe 1, steam conduit 2's the outside is provided with heat preservation 3, and the level is provided with flow probe 1 between steam conduit 2 and the heat preservation 3, and flow probe 1 is the hot wire anemograph probe structure who has the hotfilm probe, and flow probe 1 is connected with signal processing center 4 through the cable.

The probe head of the flow probe 1 is in a quartz structure or a glass rod structure sprayed with a metal film.

The working principle is as follows: during the use, when steam conduit 2 takes place to leak,

steam conduit

2 and 3 interior flow probe 1 of clearance in heat preservation and the distance of leak point have the difference, consequently, the speed of giving signal processing center 4 with digital signal transmission has the difference, through the change of different flow probe 1 digital signal in signal processing center 4, can learn the leakage position of steam conduit 2 general, can clearly learn the size of steam conduit leakage rate through the flow with the calculation relation of leakage rate, the quantitative monitoring that has realized steam conduit 2 and the accurate calculation of leakage position.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A main steam pipeline leakage monitoring system based on flow measurement comprises a flow probe (1), a steam pipeline (2) and a signal processing center (4), and is characterized in that: the flow probe is characterized in that a heat insulation layer (3) is arranged on the outer sides of the flow probe (1) and the steam pipeline (2), the flow probe (1) is horizontally arranged between the steam pipeline (2) and the heat insulation layer (3), the flow probe (1) is of a hot wire anemograph probe structure with a hot film probe, and the flow probe (1) is connected with a signal processing center (4) through a cable.

2. The main steam line flow measurement based leakage monitoring system of claim 1, wherein: the probe of the flow probe (1) is of a quartz body structure or a glass rod structure sprayed with a metal film.