Development of 3-D. Displacement Measurement System for Critical Pipe of Fossil Power Plant

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1. 서 론

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화력발전소 주배관 차원 변위측정시스템 개발 3

송기욱^*․현중섭^*․하정수^*․조선영^**

Development of 3-D. Displacement Measurement System for Critical Pipe of Fossil Power Plant

G.W. Song, J.S. Hyun, J.S. Ha, and S.Y. Cho

Key Words:

3-D Displacement Measurement System(3차원 변위측정시스템), LVDT Type

식 센서 고온 증기배관

Sensor(LVDT ), High Temperature Steam Pipe( ), Fossil Power 화력발전소

Plant( ).

Abstract

Most domestic fossil power plant have exceeded 100,000 hours of operation with the severe operating condition. Among the critical components of fossil power plant, high temperature steam pipe system have had a many problems and damage from unstable displacement behavior because of frequent start up and shut down. In order to prevent the serious damage and failure of the critical pipe system in fossil power plant, 3-dimensional displacement measurement system were developed for the on-line monitoring system. 3-D Measurement system was developed with using the LVDT type sensor and rotary encoder type sensor, this system was installed and operated on the real power plant successfully. In the future time, network system of on-line diagnosis for critical pipe will be designed.

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한국전력공사 전력연구원 발전연구실

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(주) K.R. 정밀

(2)

.

2. 2-1

3 (sensor) .

LVDT ,

(Rotary Encoder) .

LVDT

, , , ,

Fig. 1 Core

Coil Coil

. Core (Ve)

VA=VB V0=0 . Core

VA VB

,

V0 .

, (Ve)

Core VA VB

.

Fig. 1. Displacement LVDT Sensor

,

.

disk shaft ,

,

.

, LVDT

1

3 .

Fig. 2 3

.

3 ( ,

, )

.

Fig. 2 Scheme Diagram

동점 A

거리 r

(LVDT) 회전각, θ φ, (Encoder 1, 2)

.

Encoder LVDT . ,

Moment Free ,

Encoder , ,

LVDT , r .

2-2 Mock-up

3 Mock-up

Fig. 3 .

, Free

.

LVDT rod 1

(3)

3 .

3 , x,

y, z 3 .

Fig. 3 3

2-3. Mock-up 3

,

4 .

3 . Table 1

-0.09

+0.15% 0.15%

.

Table 1

3. 3 LVDT Encoder

.

, analogue digital

local server data ,

.

3-1.

3 analogue 2 Encoder Digital

Output 20 bit LVDT Analog Output 1CH

(0~10V) , analogue

local server .

. TCP/IP , RS232 & RS 485 ,

, , . , TIP/IP RS232 & RS485

data

. data

AD converter

terminal .

,

PC RS-485

DC ±24V .

3-2. 3

, Fig. 4 . Program tool NI

LabVIEW ,

. part

,

. part

monitoring

(4)

(a)

(b) Fig. 4 3

4.

3 Mock-up 3

. Mock-up

“A" 2 (Main steam line)

(MS-2 Hanger ) .

(Hanger) MS-2

Lug , 2003. 4. 22 ,

2003. 8. 12 110 .

4-1. Mock-up

3 (Deadweight)

(Hanger) MS-2 (Fig.

5) .

,

Fig.

6 Clamp . Clamp

2 Clamp

,

Rod . Clamp

200mm

.

Fig. 5 "A" (MS-2)

Fig. 6 MS-2 Clamp

4-1-2.

(5)

1) 3 ,

. 3

Fixture .

,

, .

, 3

Truss .

.

Fig. 7 3

MS-2 Clamp

.

Fig. 7

2) 3

, 3 Fixture

Clamp

(OD100×10t) 3

Fig. 8 .

4-2.

4-2-1.

Fig. 9 Cold Warm Start

“A" 2 .

.

Fig. 8

(a) Cold Start-up schedule

1 2 3 4 5 6 7 8 9 10 11 12

4000 3000 2000 1000 100 200 300 400 500 600

200

150

100 50 100

20 40 60 80

S P E E D ( r p m )

L O A D ( % )

P R E S S ( k g /c m )

T e m p ( °C )

2

500°C MAIN STM TEMP

169 kg/cm MAIN STM PR ²

60kg/cm ² 300°C

3600RPM TBN SPEED

800RPM

100% LOAD

TBN BRG RUB CHECK

LOW SPEED HEAT SHOCK

INITIAL LOAD

START-UP TR UNIT AUX TR FA PA

BLR TBN

PULV HTR SERVICE AUX STM CHANGE

VACUUM- CHEST

UP WARMING

0 13 14

50% BFP-T (# B) BFPM 정지

BFP-T (# A)

PULV PULV PULV

(b) Warm Start-up schedule

1 2 3

4 5 6 7 8 9 10 11

4000 3000 2000 1000 100 200 300 400 500 600

200

150

100 50 100

20 40 60 80

S P E E D ( r p m )

L O A D ( % )

P R E S S ( k g /c m )

T e m p ( °C )

2

500°C MAIN STM TEMP

169 kg/cm MAIN STM PR

²

300°C

3600RPM TBN SPEED

100% LOAD

TBN BRG RUB CHECK LOW SPEED HEAT SHOCK

INITIAL

LOAD START-UP TR UNIT AUX TR

FA PA

BLR TBN

PULV(#C) PULV(#D) PULV(#B) PULV(#E) HTR SERVICE AUX STM CHANGE

VACUUM- CHEST

UP WARMING

0 ( HR)

1₂

50% BFP-T (# B) ( HR)

2¹

( HR)2¹

Fig. 9

4-2-2. 3

(6)

Pipeplus . Fig. 9 Cold Start-up

.

Fig. 10

, Cold Start-up

(100% Load) 500 , 169kg/cm2 x

32mm, y 50mm, z -44mm

(Fig. 11, 12).

. MS-2

Indicator ,

Cold(Indicator : "2") 80% (Indicator :

"7") 40mm .

Fig. 11 MS-2

4-2-3. Mock-up

Fig. 12 4 21 110

x, y, z

. dx, dy, dz x, y, z ,

dist 3 .

Mock-up

y 40mm ,

30 35mm ,

3 . Fig. 13

. 110

5 ,

3 .

Fig. 12

(7)

Fig. 13

4-3.

4-3-1.

(Remote monitoring)

solution system .

.

data acquisition system local server

. data acquisition system RS485

terminal(connection & signal amplifier), AD

board . local server

data

(server) 3

,

.

4-3-2. Network system

3 local server

data 3 , ,

. 3

, ,

.

local server data ,

,

data , data

.

Fig. 14 Schematic diagram of Network

Fig. 15 Monitoring and networking system

(8)

3 .

3 LVDT, Enocder,

,

, , 110

.

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(2) F. V. Naugle, "Illustrative Elevated-Temperature Piping Analysis Using Stress Indices,"

PVP-Vol.86, Design of Elevated Temperature Piping, ASME 1984, pp. 17-41.

(3) Fournier et al, "On-line Fatigue Monitoring and Matgins Probablistic Assessment", SMIRT-12K.

Kussmaul, North-Holland, 1993, pp. 271-276.

(4) M. T. Flaman, B. E. Mills, Development of a Strain Gauge Based On-line Structural Integrity Monitoring System for Fossil-Fuelled G.S., CEA Project No. 726 G 627, Ontario Hydro Research Division, USA, 1992

(5) Y. Takahashi, et al, "Trend of Operating Data

Monitoring and Fatigue Evaluation System for

BWR in Japan", SMIRT-12K. Kussmaul,

North-Holland, 1993, pp. 265-270.