millenium edge heating in hot strip mills chinese

ROTELEC() 9 TEL: 86-21-6832 1036; FAX: 86-21-6832 0319 : 1380 178 6366; E-mail: [email protected]

C 1980 /( 1)

1

Siebo Kunstreich

[1]. J.Hellegouarch, G.Prost, J.Ruer (Rotelec), Revue de Metallurgie Juillet-Aout 1989, p.593-602

[2]. S.Fukushima, K.Okamura, T.Kase (Sumitomo Wakayama), G.Prost (Rotelec), IEEE Transactions on Industr.

Applic., Vol.29,No.5, Sept/Oct.1993, p.854-858

[3]. F.Blanchet, G.Dantin, T.Perasse, G.Prats, G.Roux (Sollac Fos), Revue de Metallurgie Sept.1991, p.1134-1141

[4]. C.Queens (Thyssen Krupp Stahl Beeckerwerth), private communication

[5]. G.Roux (Sollac Fos) , private communication

[6]. Picture from BHP Western Port

[7]. Picture from China Steel Corporation, Kaohsiung, hot strip mill No.2

C() Roebel () () /

16HMI ()()


6.1 L1 L2

T L2 PLC/PC T L2 ( 15)

() () () (T T )

PLC () PLC/PC

L2 HMI HMI()T 15 HMI PLC 6.2

PLC/PC ()

PLC

PLC

6.3 T ()

152T L2 16

15HMI L2 ()//


70 P1,000kw() 90 10 PINVPINV2,400kw

PTR PTR2,900kVA

() KW KVA

5.2

0 0(LC)-1/2 L C 250300Hz

T0 P( 3)

PP/ P P vP t T0T0 t T0 PLC PLC P P P P 10 PMAX

THERMAL POWER INTO P TH = k 1 t v T(x) dx [kW] 700

= k2 t v T0

ELECTRICAL PER EDGE :

(=0.70 at gap 150mm) P EL = P TH / [kW] 1000

ELECTRICAL FROM INVERTERS P INV = 2 P EL +LL [kW] 2050

BAR DATA: EDGE TEMP.LOSS T0 [C] 100,0 BAR THICKNESS t [mm] 32,5 BAR SPEED v [m/s] 1;5

POWER RATING TRANSFORME: P TR [kVA] 2900 POWER RATING INVERTERS P INV = 2 P EL / 0.8 [kW] 2400

t

INVERTER

T 0

T

T 0

INVERTER

14 32.5mm 1.5m/T100 PTH700kw PEL1000kw PINV2400kw PTR2900KVA


2 mm (

6.2 ) 100 520 mm

/

1

4.3

PMAX

13100mm50mm 30mm () 230mm +100/-50mm ( 100+50mm 20+20mm 20+20mm230mm) PMAX 230mm PMAX 390kw( 10) 1.25m/30mm 100T0 P538kw 9

13 170mm 150mm +100mm -50mm 170mm 150mm PMAX 565kw 640kw ( 10) 1.25m/ 30mm T0 100 P538kw 6.2

5.1

14 ()

32.5mm 1.25m/ 100 (3) P P700kw P P 150mm

50

100 30

20 20

20 20

20 20

100

30 10 20

20 10 30

20 20

50

FIXED GAP 230mm gap for up + 100mm and down - 50mm Pth = 390 kW

ADJUSTABLE GAP BAR TOP 170mm gap for up + 100mm Pth = 565 kW

ADJUSTABLE GAP BAR TAIL 150mm gap for down - 50 mm Pth = 640 kW

13 +100/-50mm 230mm 170mm/150mm230mm PMAX390kw 170mm/150mm 565 / 640kw


PTH PMAX PTH

3.5

F1 ( 11)

( 12)

4.1

C( 1) 12

5,100 mm 2,600 mm 1,200 mm 2,400 mm 700 mm 750 mm

PLC 5 mm

5,200 mm 2,500 mm 2,600 mm 5,400 mm 10/

4.2 / PLC

11 F1 BHP Western Port

12 2


TT0 exp(-x/b) (2) b30 mm()

(1)(2) PTHCpv t bT0k v t bT0 (3)

T 56 x0 T0 T

3.3

()

2 PMAX 10 coil 40PMAXX coil 30 1997 Ccoil 40 750mm 120mmPTH780kw180mmPTH530kwcoil 45/ 800mm( 1200mm)coil 45

3.4

i) (3)(T0)(t)(v) PTH F1 F1 /()T0 ii) ()PMAX 10 4.3 iii) i)// PTH ii) PMAX PMAX

Temperature rise delta T versus

distance from edge

0

20

40

60

80

100

120

140

0 50 100 150distance from edge [mm]

tem

pera

ture

ris

e de

lta T

[ ]

standard slope 30

steep slope 23

flat slope 40

Computation data: specific heat 0,157 kcal/kgC specific weight 7,55 kg/cm3 Required thermal power PTH= 538 kW at T=100C, speed 1,25 m/s, thickness 30 mm

9 T100 30 mm 1.25 m/ PTH538 kw

M axim u m th erm al p ow er versu s gap on e in d u ctor p er ed ge

0

200

400

600

800

1000

1200

50 100 150 200 250 300 350electrica l gap [m m ]

ther

mal

pow

er P

th [k

W] co il 40

co il 45co il 30

10 Coil 30 Coil 40 750mm Coil 45


()() 50mm[2]

[3] 6500 510 1/3[5]

.

T T

2550mm

()()

T

.2

PTH t v xT

PTHCpv tT dx Cp (1)

T

Distance across hot band width [mm]

squares: with edge heatercrosses: without edge heater













50mm

NUMBER OF HOT ROLLING SEQUENCE

% O

F D

EFE

CT

IVE

CO

ILS

8 ()y=0


.

100

.

.

Ar3 30mm 14mm 1430mm 25mm [3]

[4]

Half thickness

Average temperature In thickness direction [C]1025

1000

975

950 0 50 100 150

Distance from edge [mm]

Bar edge temperature distribution

104010301020

1010

50100

STRIP MICROSTRUCTURE AT 25 mm FROM EDGE WITHOUT EDGE HEATER WITH EDGE HEATER

Distance from hot band edge [mm]

Strip

edg

e su

rface

tem

pera

ture

[C

]

STRIP MICROSTRUCTURE AT 25 mm FROM EDGE WITHOUT EDGE HEATER WITH EDGE HEATER

Distance from hot band edge [mm]

Strip

edg

e su

rface

tem

pera

ture

[C

]

2mm AR3+20 25mm 30mm 14mm 16mm [3]

4


Danieli Rotelec() Siebo Kunstreich

()UC UC C

U 1988

Sollac/Fos C[1]()[2]

C 1987 Sollac/Fos C 1989 ROTELEC NKK Keihin (1989 )(1990 1993 )(1994 )(1996 ) BHP Western Port (1998 ) Beeckerwerth (1999 ) Bruckhausen(2000 )

U C

C

C U

gap

U-type inductor C-type inductor

gap

U-type inductor C-type inductor

EFFI

CIE

NC

Y [%

]

EFFICIENCY OF 'U-TYPE' AND 'C-TYPE' EDGE HEATER

ELECTRICAL GAP [ mm]

2C U ROTELEC C

millenium edge heating in hot strip mills chinese

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