CN216815601U

CN216815601U - Nuclear sampling system electromagnetic flowmeter and sampling system

Info

Publication number: CN216815601U
Application number: CN202121965699.7U
Authority: CN
Inventors: 余知府; 周杨; 张崇浩; 杨兵圣; 尤兵; 刘仁朋; 王征勇; 李本荣; 李非
Original assignee: CNNC Fujian Nuclear Power Co Ltd
Current assignee: CNNC Fujian Nuclear Power Co Ltd
Priority date: 2021-08-20
Filing date: 2021-08-20
Publication date: 2022-06-24
Anticipated expiration: 2031-08-20

Abstract

The utility model relates to the field of nuclear power equipment, in particular to an electromagnetic flowmeter and a sampling system of a nuclear sampling system. Nuclear sampling system electromagnetic flowmeter from inside toward having set gradually outward: a liner, a measurement tube, a field coil, and a welded tube assembly; an embedded installation mode is adopted among the four components. The sampling system comprises the nuclear sampling system electromagnetic flowmeter in the technical scheme. According to the electromagnetic flowmeter of the nuclear sampling system, the lining is designed to be embedded, so that the equipment reliability of the electromagnetic flowmeter is improved, and the normal flow is ensured.

Description

Nuclear sampling system electromagnetic flowmeter and sampling system

Technical Field

The utility model relates to the field of nuclear power equipment, in particular to an electromagnetic flowmeter and a sampling system of a nuclear sampling system.

Background

The hualong one-core sampling system centrally extracts liquid and gas samples for chemical analysis and radiochemical analysis by manual or automatic (boron concentration meter). Samples were taken from the reactor coolant system, the effluent treatment system, and other ancillary systems such as the secondary side of the steam generator and Steam Generator (SG) blowdown system.

The nuclear sampling system continuously monitors the boron concentration of the reactor coolant (the boron concentration in the reactor coolant can directly influence the reactivity change of a reactor core and even shutdown of the reactor), can indicate effective shutdown allowance and detect the mistaken dilution of the reactor coolant during the power operation or hot standby, hot shutdown, normal cold shutdown, refueling or maintenance shutdown of a unit. The liquid sample is taken from a reactor coolant system, a waste heat removal system and a chemical volume control system, the flow rate of the liquid sample is measured and displayed by an electromagnetic flowmeter, the measuring principle of the electromagnetic flowmeter is based on Faraday's law of electromagnetic induction, a measuring tube of a sensor is a non-magnetic conductive alloy short tube lined with insulating materials, two electrodes penetrate through the tube wall along the tube diameter direction and are fixed on the measuring tube, and the electrode tips of the electrodes are basically flush with the inner surface of the lining. When the excitation coil is excited by bidirectional square wave pulses, a working magnetic field is generated in a direction perpendicular to the axis of the measuring tube. At this time, if a fluid having a certain conductivity flows through the measuring tube, an electromotive force is induced by cutting the magnetic lines. The electromotive force is proportional to the product of the magnetic flux density of the working magnetic field and the inner diameter and flow velocity of the measuring tube, and the electromotive force (flow signal) is detected by the electrode and sent to the converter through the cable. The converter can display flow and total amount after amplifying the flow signal, and can output pulse, analog current and other signals. When the problem appeared in the electromagnetic flowmeter lining, the electromagnetic flowmeter can appear not have the flow, flow trouble or jam the condition such as, and the unable normal sample of staff, the unable boron concentration of measuring of low reaches boron meter seriously influences unit normal operating.

In the first global stacking site of Hualongyi, the process structure of the lining part of the electromagnetic flowmeter of the nuclear sampling system is flanging and protruding, so that the conditions of damage to the lining, internal blockage of the electromagnetic flowmeter and the like are caused for many times during cold-state tests and hot-state tests, and key nodes of a unit are seriously restricted. The direct cause of meter no flow was found by field analysis:

(1) the gasket of the electromagnetic flowmeter is seriously deformed and the position of the gasket is changed;

(2) the liners of the electromagnetic flowmeters are damaged to different degrees;

(3) the flow holes of the electromagnetic flowmeter become obviously smaller.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: the utility model provides a nuclear sampling system electromagnetic flowmeter and sampling system improves electromagnetic flowmeter's equipment reliability, guarantees that the flow is normal.

The utility model provides an electromagnetic flowmeter of a nuclear sampling system, which is sequentially provided with: a liner, a measurement tube, a field coil, and a welded tube assembly; an embedded installation mode is adopted among the four components.

Preferably, the lining is embedded in the measuring tube, the excitation coils are fixed on the upper side and the lower side of the middle of the measuring tube, and the outermost layer is a welded tube assembly.

Preferably, the inner hole diameter of the lining is 5-10 mm.

Preferably, the length of the electromagnetic flowmeter of the nuclear sampling system is 180-220 mm.

Preferably, the outer diameter of the lining is 30-40 mm.

Preferably, the pipe diameter of the welded pipe assembly is 15-20 mm.

Preferably, the length of the nuclear sampling system electromagnetic flowmeter is 200mm, the outer diameter of the lining is 36mm, the inner aperture of the lining is 6mm, and the pipe diameter of the welded pipe assembly is 16 mm.

The utility model also provides a sampling system which comprises the nuclear sampling system electromagnetic flowmeter in the technical scheme.

Preferably, the nuclear sampling system electromagnetic flowmeter is connected with the pipeline through a flange and is fastened through bolts.

Preferably, after the nuclear sampling system electromagnetic flowmeter is connected with the pipeline, the lining is not directly extruded, and sealing is completed through stress extrusion between the protruding welded pipe assembly and the gasket.

Compared with the prior art, the electromagnetic flowmeter for the nuclear sampling system is characterized in that the lining is designed to be embedded, and the protruding lining is wrapped in the flange surface, so that the output of flow signals is not influenced. The nuclear sampling system greatly reduces the blocking probability of the electromagnetic flowmeter, ensures the smoothness of a nuclear sampling loop, ensures the normal monitoring of the boron concentration and accurately controls the reactivity of the reactor core of the Hualong; the stability and reliability of the equipment are greatly improved; for subsequent maintenance work, the labor cost is reduced, the radiation dose borne by workers is reduced, the working time of the maintenance workers is shortened, and the smooth performance of chemical sampling work is guaranteed. Experiments prove that the electromagnetic flowmeter of the nuclear sampling system is good in field use condition at present.

Drawings

FIG. 1 is a schematic diagram of a nuclear sampling system electromagnetic flowmeter according to the present invention;

in the figure, the position of the upper end of the main shaft,

1 is a lining, 2 is a measuring tube, 3 is a field coil, and 4 is a welded tube assembly.

Detailed Description

For a further understanding of the utility model, embodiments of the utility model are described below in conjunction with the examples, but it should be understood that these descriptions are included merely to further illustrate features and advantages of the utility model, and are not intended to limit the utility model.

The embodiment of the utility model discloses an electromagnetic flowmeter of a nuclear sampling system, which is sequentially provided with the following components from inside to outside as shown in figure 1: a lining 1, a measuring pipe 2, a magnet exciting coil 3 and a welded pipe assembly 4; an embedded installation mode is adopted among the four components.

The lining 1 is embedded in a measuring tube to ensure that fluid does not contact with other parts when passing through the electromagnetic flowmeter;

the magnet exciting coil 3 is fixed on the upper and lower sides of the middle part of the measuring pipe 2, and the outermost layer is a welded pipe assembly 4.

The inner aperture of the lining 1 is preferably 5-10 mm.

The length of the nuclear sampling system electromagnetic flowmeter is preferably 180-220 mm.

The outer diameter of the lining 1 is preferably 30-40 mm.

The preferred pipe diameter of welded tube subassembly 4 is 15 ~ 20 mm.

More preferably, the length of the nuclear sampling system electromagnetic flowmeter is 200mm, the outer diameter of the lining 1 is 36mm, the inner hole diameter of the lining 1 is 6mm, and the pipe diameter of the welded pipe assembly 4 is 16 mm.

The transformation of the nuclear sampling system electromagnetic flowmeter changes the process structure of the lining part of the electromagnetic flowmeter from the prior flanging to protruding into an embedded structure, and the protruding lining is wrapped in the flange surface, so that the output of flow signals is not influenced.

The transformation of the nuclear sampling system electromagnetic flowmeter has the advantages that the size of the aperture of the fluid inlet and the fluid outlet of the electromagnetic flowmeter cannot be extruded, output signals are more stable, equipment is more reliable, and the sampling requirement of sampling personnel is met.

The embodiment of the utility model also discloses a sampling system which comprises the nuclear sampling system electromagnetic flowmeter in the technical scheme.

The nuclear sampling system electromagnetic flowmeter is connected with a pipeline through a flange and fastened through bolts. Preferably, the fastening is performed by 4-8 bolts.

After the electromagnetic flow meter of the nuclear sampling system is connected with a pipeline, the lining is not directly extruded, and the sealing is completed through the stress extrusion between the convex welded pipe assembly and the gasket, so that the lining cannot be damaged.

In a nuclear power unit, a nuclear sampling system is installed in a mode that:

1. installing an electromagnetic flowmeter between pipeline flanges;

2. the flange surfaces on the two sides of the electromagnetic flowmeter are ensured to be parallel and centered, and no external force is exerted;

3. connecting a primary meter and a secondary meter of the electromagnetic flowmeter to be electrified;

4. the pipeline is filled with water, and the flow is monitored.

The above description of the embodiments is only intended to facilitate the understanding of the method of the utility model and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a nuclear sampling system electromagnetic flowmeter which characterized in that, from interior toward outer having set gradually: a liner, a measurement tube, a field coil, and a welded tube assembly; an embedded installation mode is adopted among the four components;

the lining is embedded in the measuring tube, the excitation coils are fixed on the upper side and the lower side of the middle part of the measuring tube, and the outermost layer is a welded tube assembly; the inner aperture of the lining is 5-10 mm; the outer diameter of the lining is 30-40 mm; the pipe diameter of welded pipe subassembly is 15 ~ 20 mm.

2. The nuclear sampling system electromagnetic flowmeter of claim 1 wherein the nuclear sampling system electromagnetic flowmeter is 180-220 mm in length.

3. A nuclear sampling system electromagnetic flowmeter according to any one of claims 1 to 2 wherein the nuclear sampling system electromagnetic flowmeter has a length of 200mm, the liner has an outer diameter of 36mm, the liner has an inner bore diameter of 6mm and the welded tube assembly has a tube diameter of 16 mm.

4. A sampling system comprising the nuclear sampling system electromagnetic flowmeter of any one of claims 1 to 3.

5. The sampling system of claim 4, wherein the nuclear sampling system electromagnetic flow meter is flanged to a pipeline and fastened by bolts.

6. The sampling system of claim 4, wherein the liner is not directly compressed after the nuclear sampling system electromagnetic flow meter is coupled to the pipeline, and the seal is achieved by forced compression between the projecting welded tube assembly and the gasket.