CN114360754A

CN114360754A - Method for measuring friction force of pressure container supporting and adjusting base plate

Info

Publication number: CN114360754A
Application number: CN202111483297.8A
Authority: CN
Inventors: 王威; 伍龙燕; 汪景新; 席京彬
Original assignee: Huaneng Group Technology Innovation Center Co Ltd; Huaneng Nuclear Energy Technology Research Institute Co Ltd
Current assignee: Huaneng Group Technology Innovation Center Co Ltd; Huaneng Nuclear Energy Technology Research Institute Co Ltd
Priority date: 2021-12-07
Filing date: 2021-12-07
Publication date: 2022-04-15

Abstract

The invention provides a method for measuring the friction force of a pressure vessel supporting and adjusting base plate. The invention has the beneficial effects that: the friction force measuring method adopts the high-temperature strain gauge to acquire data, the strain gauge and the cable in the monitoring system can bear the high temperature of more than 200 ℃, and the acquired data is reliable and effective. The stress condition of the height adjusting base plate can be indirectly calculated by combining the conditions of the supporting structure form of the pressure container, the weight of the equipment, the operating condition and the like. The method can also be used for measuring the friction force of various pressure-bearing systems and special equipment through adaptive adjustment.

Description

Method for measuring friction force of pressure container supporting and adjusting base plate

Technical Field

The invention relates to the technical field of nuclear energy equipment, in particular to a method for measuring the friction force of a pressure container supporting and adjusting base plate.

Background

The high-temperature gas cooled reactor has the characteristics of inherent safety and high operation temperature, and is an advanced nuclear energy system with the characteristics of four generations. As shown in fig. 1, each reactor pressure vessel includes 4 support lugs 2, and 1 matching adjusting shim plate 1 is arranged between the support lugs 2 and the support cushion 3 for adjusting the pressure vessel 4 to be kept in a horizontal state. The supporting seat cushion 3 is supported by a reactor pressure vessel bearing supporting embedded part 5, and the 4 supporting lugs 2 of the reactor pressure vessel limit the axial and circumferential displacement of the pressure vessel 4 but not the radial thermal displacement, so that the axial position of the reactor pressure vessel is fixed and only can be thermally expanded along the radial direction.

During the temperature and pressure rise of the nuclear island system, the supporting lug frames 2 can move towards the cabin wall surface 6 along the radial direction, and the positioning pins of the adjusting base plate can be sheared under extreme conditions, so that the supporting lug frames 2 drive the adjusting base plate 1 to move out of the original position, and adverse effects are brought to the safe operation of equipment.

At present, research work in the field is not carried out at home and abroad, and a method for measuring the friction force borne by the adjusting base plate is necessary to be researched, so that the influence of the friction force generated by the adjusting base plate due to dislocation and slippage on the structure of equipment is analyzed, and technical support is provided for equipment safety evaluation and establishment of a scientific and reasonable adjusting base plate reinforcing scheme.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

The invention aims to provide a method for measuring the friction force of a pressure vessel supporting adjusting base plate, which is used for measuring the friction force generated in the process that a pressure vessel supporting lug frame slides along the supporting adjusting base plate during the thermal test of a nuclear island system so as to evaluate the extreme stress state of the adjusting base plate and further determine the reasonable reinforcing mode of the adjusting base plate.

The embodiment of the application provides a method for measuring the friction force of a pressure vessel supporting and adjusting base plate.

In some embodiments, the left side of the fixed plate is welded and fixed on the side part of the load-bearing support embedded part of the reactor pressure vessel, the right side of the fixed plate is welded and fixed on the adjusting backing plate, and the welding position is located on the upper end surface of the adjusting backing plate.

In some embodiments, the left side of the fixing plate is an arc-shaped surface, and the welding surface of the arc-shaped surface and the load-bearing supporting embedded part of the reactor pressure vessel is an inclined surface.

In some embodiments, the edge of the upper end of the right side of the fixing plate is provided with a protruding end outwards to form a step structure, the left side of the backing plate is abutted against the lower part of the protruding end of the fixing plate, and the right side of the protruding end is welded and fixed on the upper end surface of the adjusting backing plate.

In some embodiments, the strain gauge is provided with a plurality of strain gauges which are uniformly distributed on the upper end surface and/or the lower end surface of the fixing plate.

In some embodiments, the strain gauges are arranged on the upper end surface and/or the lower end surface of the fixing plate at a longitudinal middle position to form a single row.

In some embodiments, the strain gage is a high temperature strain gage.

In some embodiments, the fixing plate is made of a low alloy steel plate.

In some embodiments, the fixation plate remains horizontal after assembly.

In some embodiments, the strain gage is attached to the mounting plate with the attachment area polished smooth prior to attachment.

The invention has the beneficial effects that:

1. the friction force measuring method adopts the high-temperature strain gauge to acquire data, the strain gauge and the cable in the monitoring system can bear the high temperature of more than 200 ℃, and the acquired data is reliable and effective.

2. The stress condition of the height adjusting base plate can be indirectly calculated by combining the conditions of the supporting structure form of the pressure container, the weight of the equipment, the operating condition and the like.

3. The method can also be used for measuring the friction force of various pressure-bearing systems and special equipment through adaptive adjustment.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent from and readily appreciated by reference to the following description of the embodiments taken in conjunction with the accompanying drawings,

wherein:

FIG. 1 is a schematic diagram of the position relationship between a load bearing support insert and a trim plate of a reactor pressure vessel according to the prior art;

FIG. 2 is a schematic view illustrating an installation position of a fixing plate according to an embodiment of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is a top view of the fixation plate of FIG. 2;

reference numerals:

1-adjusting a base plate; 2-supporting ear frames; 3-supporting the seat cushion; 4-a pressure vessel; 5-a reactor pressure vessel bearing support embedded part; 6-cabin wall surface; 7-fixing the plate; 8-inclined plane; 9-a protruding end; 10-strain gauge.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The method for measuring the frictional force of the pressure vessel support adjusting shim plate according to the embodiment of the invention will be described below with reference to the accompanying drawings.

As shown in fig. 2, in the method for measuring the friction force of the pressure vessel supporting adjusting shim plate provided in the embodiment of the present application, a fixing plate 7 is installed between the adjusting shim plate 1 and the reactor pressure vessel load-bearing supporting embedded part 5, a strain gauge 10 connected to a data acquisition system is installed on the fixing plate 7 to acquire strain data, and after the strain measurement data is obtained, a finite element model is combined to perform comparative analysis, so as to estimate the friction force generated on the upper surface of the adjusting shim plate 1. The method specifically comprises the following steps:

(1) the fixing plate 7 is processed. And (3) measuring the width dimension of the adjusting base plate 1 and the distance between the adjusting base plate 1 and the load-bearing supporting embedded part 5 of the reactor pressure vessel, selecting a low-alloy steel plate, and processing a fixing plate according to the measured dimension.

(2) The fixing plate 7 is installed. Firstly, a fixed plate 7 is assembled between an adjusting base plate 1 and a reactor pressure vessel bearing support embedded part 5 to ensure that the fixed plate 7 keeps a horizontal state after being assembled, then two ends of the fixed plate 7 are respectively welded according to welding process rules, as shown in figure 3, the left end is welded through with the reactor pressure vessel bearing support embedded part 5, the right end is connected with an angle welding line of the adjusting base plate 1, and the welding line needs PT detection to be qualified.

(3) And (4) mounting a high-temperature strain gauge and debugging a data acquisition system. As shown in fig. 4, 4 unidirectional high-temperature strain gauges are uniformly adhered to the designated position of the upper surface of each fixing plate 7, and before adhesion, the adhering area needs to be polished smooth. The strain gauge 10 and the data acquisition system are connected through a high-temperature wire, and the system is debugged to work normally.

(4) And acquiring strain data. During the system hot test, the strain acquisition system is started, and the strain data acquired by each strain gauge is recorded in the whole process.

(5) And according to the strain measurement data, performing comparative analysis by combining a finite element model, and reasonably and conservatively estimating the friction force generated on the upper surface of the adjusting base plate.

For each setting mat 1, a fixing plate 7 is mounted. On the surface of each

fixed plate

7, 4 high temperature strain gauges are arranged. During the hot test of the nuclear island system, the strain gauge 10 measures and records the compressive strain on the fixed plate 7 in the radial direction of the pressure vessel. The actual stress state of the adjusting shim plate 1 can be calculated conservatively and indirectly by utilizing the data acquired by the high-temperature strain gauge.

The left side of the fixed plate 7 is welded and fixed on the side part of the bearing support embedded part 5 of the reactor pressure vessel, the right side of the fixed plate 7 is welded and fixed on the adjusting backing plate 1, and the welding position is located on the upper end face of the adjusting backing plate 1.

The left side of the fixed plate 7 is an arc-shaped surface, and the welding surface of the arc-shaped surface and the bearing and supporting embedded part 5 of the reactor pressure vessel is an inclined surface 8. The arc-shaped surface is used for being attached to the pressure vessel bearing and supporting embedded parts 5, and the pressure vessel 4 is of a cylindrical structure.

The edge of the upper end of the right side of the fixing plate 7 is outwards provided with a protruding end 9 to form a step structure, a clamping groove is formed below the protruding end 9, the left side of the adjusting base plate 1 abuts against the clamping groove below the protruding end 9 of the fixing plate 7, and the right side of the protruding end 9 is welded and fixed on the upper end surface of the adjusting base plate 1.

In some specific embodiments, the lower end surface of the fixing plate 7 is flush with the lower end surface of the adjustment pad 1 or slightly lower than the lower end surface of the adjustment pad 1. In order to enable the adjusting shim plate 1 to be completely stressed on the fixing plate 7, the measurement of the strain gauge 10 is more accurate.

In some embodiments, the width of the protruding end 9 is 5-7 mm. The fixing plate 7 is convenient to be welded after being lapped on the adjusting backing plate 1.

In some specific embodiments, the number of the strain gauges 10 is not less than 3, and the strain gauges are uniformly distributed on the upper end surface and/or the lower end surface of the fixing plate 7. If the number of the measured data is less than 3, the error of the measured data is larger; theoretically, it is better to set the strain gauge 10 more, but the cost is also considered, and the accuracy of measurement is satisfied by setting 4 strain gauges as in the present embodiment.

In some embodiments, the strain gauges 10 are disposed on the upper end surface and/or the lower end surface of the fixing plate 7 at a longitudinally intermediate position (similar to a median line, i.e., a line connecting midpoints of two narrow sides) to form a single row. The measured data is more accurate.

In some specific embodiments, the strain gage 10 is a high temperature strain gage. Can bear high temperature above 200 ℃, and the collected data is reliable and effective.

In some embodiments, a plurality of high temperature strain gauges may be disposed according to the length of each fixing plate 7, so as to achieve the purpose of accurate measurement.

In some specific embodiments, the distance between two adjacent strain gauges 10 is 200mm, and the distance between each strain gauge 10 and the protruding end 9 is 110 mm.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A method for measuring the friction force of a pressure vessel supporting and adjusting base plate is characterized in that a fixing plate is arranged between the adjusting base plate and a reactor pressure vessel bearing and supporting embedded part, a strain gauge connected with a data acquisition system is arranged on the fixing plate to acquire strain data, and after the strain measurement data are obtained, a finite element model is combined to perform comparative analysis, so that the friction force generated on the upper surface of the pressure vessel supporting and adjusting base plate is estimated.

2. The method for measuring the friction of the pressure vessel support adjusting shim plate according to claim 1, wherein the left side of the fixing plate is welded and fixed to the side portion of the reactor pressure vessel load-bearing support embedded part, the right side of the fixing plate is welded and fixed to the adjusting shim plate, and the welding position is located on the upper end face of the adjusting shim plate.

3. The method of claim 2, wherein the left side of the fixed plate is an arc-shaped surface, and the welding surface of the arc-shaped surface and the embedded bearing part of the reactor pressure vessel is an inclined surface.

4. The method as claimed in claim 2, wherein the upper edge of the right side of the fixed plate is outwardly provided with a protruding end to form a step structure, the left side of the pad is supported against the lower side of the protruding end of the fixed plate, and the right side of the protruding end is welded and fixed to the upper end surface of the adjusting pad.

5. The method for measuring the friction of the pressure vessel supporting and adjusting base plate according to claim 1, wherein the strain gauges are uniformly distributed on the upper end surface and/or the lower end surface of the fixing plate.

6. The method as claimed in claim 1, wherein the strain gauge is disposed at a middle position in a longitudinal direction of the upper end surface and/or the lower end surface of the fixing plate to form a single row.

7. The method of claim 1 wherein the strain gage is a high temperature strain gage.

8. The method of measuring the frictional force of a support trim pad of a pressure vessel according to any one of claims 1 to 7, wherein the fixing plate is made of a low alloy steel plate.

9. The method of claim 1, wherein the mounting plate remains horizontal after assembly.

10. The method of claim 1, wherein the strain gauge is attached to the mounting plate and the area of attachment is smoothed prior to attachment.