CN109307471A - A kind of nuclear power station main feed pump axial displacement sensor zero point scaling method - Google Patents

A kind of nuclear power station main feed pump axial displacement sensor zero point scaling method Download PDF

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Publication number
CN109307471A
CN109307471A CN201811345081.3A CN201811345081A CN109307471A CN 109307471 A CN109307471 A CN 109307471A CN 201811345081 A CN201811345081 A CN 201811345081A CN 109307471 A CN109307471 A CN 109307471A
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CN
China
Prior art keywords
axial displacement
pump shaft
pump
displacement sensor
zero point
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CN201811345081.3A
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Chinese (zh)
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CN109307471B (en
Inventor
文学
向先保
江腊涛
刘检军
童益华
杨全超
吴明
杜召瑞
安峰
陈锦裕
李宏
田涛
林淞
陈勇
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福建福清核电有限公司
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Publication of CN109307471A publication Critical patent/CN109307471A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00Measuring arrangements characterised by the use of electric or magnetic means
    • G01B7/02Measuring arrangements characterised by the use of electric or magnetic means for measuring length, width or thickness

Abstract

The present invention relates to a kind of nuclear power station main feed pump axial displacement sensor zero point scaling methods, comprising the following steps: pump shaft rotation round is divided into n equal part by the first step;Pump shaft, is defined as the negative direction of axial displacement by second step, the positive direction that the driving motor side that pump shaft pushes pump to is defined as to axial displacement away from driving motor side;Third step is recorded in the sensor axis shift value after pump shaft holding is boosted and unclamped;4th step rotates pump shaft according to the direction of rotation that pump operates normally;5th step finds out maximum sensor axial displacement value Smax of each Along ent after unclamping pump shaft;6th step finds out maximum difference Hmax;Sensor axis shift value after 7th step, record release, is labeled as a;8th step, the offset C for calculating Zero calibration;9th step, according to the resulting offset C of the 8th step, axle position displacement sensor is positioned.Using the adverse effect this invention removes tile fragment bullet amount to Zero calibration accuracy, the exact level of calibration is improved.

Description

A kind of nuclear power station main feed pump axial displacement sensor zero point scaling method

Technical field

The invention belongs to analyze and survey control technology field, and in particular to a kind of nuclear power station main feed pump axial displacement sensing Device Zero calibration method

Background technique

Main feed pump is the key that nuclear power station secondary loop power-equipment, bears to steam generator secondary side and is supplied to Water ensures the effect sufficiently to exchange heat.In existing kilowatt pressurized water reactor nuclear power station, main feed pump non-driven-end bearing room 1 electric vortex type axle position displacement sensor of common design, major function is monitoring pump shaft change in displacement, to reflect thrust disc and push away The relative position of power bearing avoids thrust bearing shoe valve inordinate wear, ensures equipment operational safety.In work such as main feed pump Disintegration overhauls Later, it needs axle position displacement sensor re-starting Zero calibration, accurately to show the axial displacement in main feed pump operational process Amount.

Since traditional axial displacement sensor zero point scaling method accuracy is insufficient, cause in certain million kilowatt presurized water reactor In the application process of nuclear power station, the high alarm failure of multiple axial displacement is produced, the availability of main feed pump is reduced, affected and be The safe and reliable operation of system and unit.

Therefore, a kind of more reliable main feed pump axial displacement sensor zero point scaling method is developed, to equipment and unit Safe and reliable operation it is most important.

Summary of the invention

It is an object of the invention to: a kind of nuclear power station main feed pump axial displacement sensor zero point scaling method is provided, it is intended to Eliminate existing Zero calibration method accuracy it is low and cause main feed pump axial displacement height alarm, and thus caused by main feed pump The low problem low with unit operation stability of availability.

Technical scheme is as follows: a kind of nuclear power station main feed pump axial displacement sensor zero point scaling method, including Following steps:

The first step, along pump shaft direction of rotation, pump shaft rotation round is divided into n equal part, and carry out serial number label;

Second step, the positive direction that the driving motor side that pump shaft pushes pump to is defined as to axial displacement, by pump shaft away from driving electricity Pusher side is defined as the negative direction of axial displacement, difference of the record pump shaft in the axial displacement value on two sides top;

Pump shaft is positioned any Along ent marked in the first step by third step, then pushes pump shaft to pump driving electricity Then pusher side unclamps until sensor axis shift value no longer increases, be separately recorded in pump shaft and keep after boosting and unclamping Sensor axis shift value;

4th step rotates pump shaft according to the direction of rotation that pump operates normally, and is sequentially recorded in remaining each Along ent for pump shaft Keep the sensor axis shift value after boosting and unclamping;

5th step finds out maximum sensor axial displacement value Smax and its Along ent of each Along ent after unclamping pump shaft Serial number;

6th step calculates separately the difference that the sensor axis shift value after pump shaft is boosted and unclamped by each Along ent subtracts each other Value, and find out maximum difference Hmax;

7th step rotates pump shaft to the Along ent of maximum axial displacement value Smax, pushes pump shaft to behind driving motor side pine It opens, the sensor axis shift value after record release is labeled as a;

8th step, the offset C for calculating Zero calibration are as follows:

9th step, according to the resulting offset C of the 8th step, by axle position displacement sensor to driving motor side moving distance C, so Axle position displacement sensor is positioned afterwards, that is, completes the calibration of axial displacement sensor zero point.

Preferably, in the first step, the n is 4-12.

Preferably, in second step, the difference of the axial displacement value on the two sides top is the thrust clearance of rotor.

Preferably, push pump shaft to pump driving motor side using with crowbar.

Preferably, in the 6th step, the difference that the shift value subtracts each other is absolute value, remaining numerical value is algebraic value.

Preferably, in the 5th step, if sensor displacement value is negative after the release of whole Along ents, should again into The row first step is to the 4th step.

Remarkable result of the invention is: 1) eliminating tile fragment bullet amount to the adverse effect of Zero calibration accuracy, improve The exact level of calibration;2) the circumferential movement inconsistency of tile fragment group is eliminated to the adverse effect of Zero calibration, is improved The exact level of calibration;3) according to the method for the present invention, in the main water supply of certain million kilowatt Class PWR Plants 1-4 unit APA Pump shaft displacement sensor implements Zero calibration, thoroughly solve the axial displacement height that is generated because Zero calibration accuracy is low alarm therefore Barrier, achieves good result;4) this method does not pass through the strength jack-up rotor such as jack, has both avoided because excessive compression causes to push away The deformation of power tiling even with parts damages caused by the reasons such as thrust disc " sucking ", also improves working efficiency.

Specific embodiment

Combined with specific embodiments below to a kind of nuclear power station main feed pump axial displacement sensor zero point mark of the present invention The method of determining is described in further detail.

A kind of nuclear power station main feed pump axial displacement sensor zero point scaling method, comprising the following steps:

The first step, along pump shaft direction of rotation, pump shaft rotation round is divided into n equal part, and carry out serial number label;

Second step, the positive direction that the driving motor side that pump shaft pushes pump to is defined as to axial displacement, by pump shaft away from driving electricity Pusher side is defined as the negative direction of axial displacement, difference of the record pump shaft in the axial displacement value on two sides top;

Pump shaft is positioned any Along ent marked in the first step by third step, then pushes pump shaft to pump driving electricity Then pusher side unclamps until sensor axis shift value no longer increases, be separately recorded in pump shaft and keep after boosting and unclamping Sensor axis shift value;

4th step rotates pump shaft according to the direction of rotation that pump operates normally, and is sequentially recorded in remaining each Along ent for pump shaft Keep the sensor axis shift value after boosting and unclamping;

5th step finds out maximum sensor axial displacement value Smax and its Along ent of each Along ent after unclamping pump shaft Serial number;

6th step calculates separately the difference that the sensor axis shift value after pump shaft is boosted and unclamped by each Along ent subtracts each other Value, and find out maximum difference Hmax;

7th step rotates pump shaft to the Along ent of maximum axial displacement value Smax, pushes pump shaft to behind driving motor side pine It opens, the sensor axis shift value after record release is labeled as a;

8th step, the offset C for calculating Zero calibration are as follows:

9th step, according to the resulting offset C of the 8th step, by axle position displacement sensor to driving motor side moving distance C, so Axle position displacement sensor is positioned afterwards, that is, completes the calibration of axial displacement sensor zero point.

Preferably, in the first step, the n is 4-12.

Preferably, in second step, the difference of the axial displacement value on the two sides top is the thrust clearance of rotor.

Preferably, push pump shaft to pump driving motor side using with crowbar.

Preferably, in the 6th step, the difference that the shift value subtracts each other is absolute value, remaining numerical value is algebraic value.

Preferably, in the 5th step, if sensor displacement value is negative after the release of whole Along ents, should again into The row first step is to the 4th step.

Claims (6)

1. a kind of nuclear power station main feed pump axial displacement sensor zero point scaling method, which comprises the following steps:
The first step, along pump shaft direction of rotation, pump shaft rotation round is divided into n equal part, and carry out serial number label;
Pump shaft is deviated from driving motor side by second step, the positive direction that the driving motor side that pump shaft pushes pump to is defined as to axial displacement It is defined as the negative direction of axial displacement, difference of the record pump shaft in the axial displacement value on two sides top;
Pump shaft is positioned any Along ent marked in the first step by third step, then pushes pump shaft to pump driving motor side, It until sensor axis shift value no longer increases, then unclamps, is separately recorded in pump shaft and keeps the sensing after boosting and unclamping Device axial displacement value;
4th step rotates pump shaft according to the direction of rotation that pump operates normally, and is sequentially recorded in remaining each Along ent and keeps pump shaft Sensor axis shift value after boosting and unclamping;
5th step, the serial number for finding out maximum sensor axial displacement value Smax and its Along ent of each Along ent after unclamping pump shaft;
6th step calculates separately the difference that the sensor axis shift value after pump shaft is boosted and unclamped by each Along ent subtracts each other, and Find out maximum difference Hmax;
7th step rotates pump shaft to the Along ent of maximum axial displacement value Smax, unclamps after pushing pump shaft to driving motor side, note Sensor axis shift value after record release, is labeled as a;
8th step, the offset C for calculating Zero calibration are as follows:
9th step, according to the resulting offset C of the 8th step, by axle position displacement sensor to driving motor side moving distance C, then will Axle position displacement sensor is positioned, that is, completes the calibration of axial displacement sensor zero point.
2. a kind of nuclear power station main feed pump axial displacement sensor zero point scaling method as described in claim 1, it is characterised in that: In the first step, the n is 4-12.
3. a kind of nuclear power station main feed pump axial displacement sensor zero point scaling method as described in claim 1, it is characterised in that: In second step, the difference of the axial displacement value on the two sides top is the thrust clearance of rotor.
4. a kind of nuclear power station main feed pump axial displacement sensor zero point scaling method as described in claim 1, it is characterised in that: Push pump shaft to pump driving motor side using with crowbar.
5. a kind of nuclear power station main feed pump axial displacement sensor zero point scaling method as described in claim 1, it is characterised in that: In 6th step, the difference that the shift value subtracts each other is absolute value, remaining numerical value is algebraic value.
6. a kind of nuclear power station main feed pump axial displacement sensor zero point scaling method as described in claim 1, it is characterised in that: In 5th step, if sensor displacement value is negative after the release of whole Along ents, the first step should be re-started to the 4th Step.
CN201811345081.3A 2018-11-13 2018-11-13 Zero calibration method for displacement sensor of main water supply pump shaft of nuclear power station CN109307471B (en)

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