Melting Furnace
March 25, 2020
500 thousand tons of high speed bar Rolling mill
March 25, 2020

Induction furnace

Description

50T medium frequency steel shell induction melting furnace

Ⅰ Technical program and specification
This program is recommended that whole set equipment of the furnace shall be equipped with two furnace bodies user can be readjusted by practical needs.
1.1 Technical program
The main equipment of this program is included 2 13000KVA rectification
transformer, 4 low voltage control cabinet, 4 power supply cabinet, total power is 26000KW. 2 50t MF induction furnace, 1 hydraulic station (double motor double pump, type electromotion), 1 cooling water device, and other auxiliary device. The electric system diagram is as follows:
The output of MF power supply is changed by furnace-changing switch, for the purpose of maintenance and alternative melting.

1.2 Technical parameter

Name

Unit

Parameter

Remark

Rated capacity

t

50

 

Max load capacity

t

60

 

Rated power

kw

26000

 

Working frequency

Hz

150

 

Melting rate

t/h

30-35

1600℃

Power consumption

kw.h/t

             560-590

1600℃

Inductor inner diameter

mm

Φ2220

 

Height of inductor

mm

3000

 

Rated temperature of the working

1600

 

Incoming voltage

v

1000

 

Incoming current

A

4050

 

Electric rectificate mode

  

24 pulse

 

Voltage of inductor

V

3400

Double voltage

Cooling water of the furnace

Pressure of incoming water

Mpa

0.25~0.3

 

Temperature of incoming water

≤5~35

 

Temperature of outlet water

≤55

 

Flow rate ( furnace body)

t/h

460

Single furnace (230)

Flow rate ( power source)

t/h

160

 

Water temperature rise of power source

10

 

Cooling water pressure for power source

Mpa

0.1~0.2

 

Hydraulic system

Working pressure

Mpa

12

Doublemotor,

double pump

Flow rate

L/min

190

 

Hydraulic medium

 

Antiwear hydraulic oil

 

Summer:N68

Winter: N46

Diameter of the hydraulic cylinder

mm

Φ320

 

Capacity of the transformer

KVA

13000×2sets

( Reference )

Primary voltage

KV

10 or 35

 

Secondary voltage

V

1000

 

Connection way

 

Extension triangle phase shift ±7.5º

namely:D(+7.5º)dyn

D(-7.5º)dyn

 

 Impedance voltage

 

8~9%

 

Phase number

 

3 phase input,6 phase output

 

Pressure adjustment way

 

No excitation

 

Cooling way

 

Strong grease

 

Ⅱ Products standard and Operating conditions
2.1 Products standard:
GB10067.3-1988 ‘Basic specifications for electroheat installations–Induction electroheat installations’
GB10067.1-1988 ‘Basic specifications for electroheat installations—General’
GB10066.3-2004 ‘Test methods for electroheat installations–Coreless induction furnaces’
GB5959.1-2005 ‘Safety in electroheat installations– General requirements’
GB5959.3-1988 ‘Safety in electroheat installations–Particular requirements for induction and conduction heating installations and induction melting installations’

2.2 Operating conditions
2.2.1 Cooling water conditions
PH:7-8.5
Hardness:<10 degrees(Each degree that 1L water contains less than 10mg calcium oxide)
Total solid content:<250mg/L
Water resistance:(Power)>100KΩ-cm
(Furnace)>2KΩ-cm

2.2.2 Power supply conditions
a. Three-phase voltage unbalancedness <5%
b. Voltage fluctuations <±5%
c. Voltage waveform distortion factor <10%

2.2.3 Geographical environment
a. Altitude above sea level <1000m
b. Temperature 5~40℃
c. Relative humidity <90%(>20℃)
d. No electric and incentive atomy, no Explosive Gas and no caustic gas
e. Avoid strong shake and concussion.

III 1 set of Medium Frequency Furnaces, Equipment list and supply range

 

No.

 

 

Description

 

 

Unit

 

Qty

Single Wt (t)

Total Wt (t)

1

25T  Medium-frequency

Induction  furnace

set

2

65

130

2

Low voltage power cabinet

set

4

2.5

10

3

Power cabinet

set

4

4.5

18

4

Compensate capacitor banks

set

2

7

14

5

Tilting hydraulic system

set

1

3

3

6

Hydraulic electric control cabinet

set

1

1

1

7

Furnace changing switch

set

1

0.5

0.5

8

Cooling water cable for furnace shell

pc

32

 

 

9

Connect cable from power cabinet to capacitor cabinet

pc

8

 

 

10

Connect cable from capacitor cabinet to Furnace changing switch

pc

12

 

 

11

Crucible mould

pc

1

 

 

12

Hydraulic pipeΦ28 (including connector)

pc

1

 

 

13

Temperature /pressure alarm system

set

1

 

 

14

Technical data

copy

1

 

 

 

Total price (USD)

 

IV Medium frequency furnaces randomness replacement parts:
1) KP 1piece、KK 1piece
2) Rectification expander board 1piece
3) Vary inversely expander board 1piece
4) Primary control program plate 1piece
5) DC electric pressure gage 1piece、DC electric current gage 1piece、coil in electric current gage 1piece、MF electric current gage 1piece、frequency table 1piece.
Annotation:This equipment hydraulic system adoption double motor double pump (one work one reservation), union take explosion proof valve.

V. Payment way:
30% advance payment, 70% payment paid before date of shipment or by L/C (opening bank need international famous bank)

VI. Management Installation :
Totally oversea charges paid by buyer. The buyer shall compensate the experts at USD 150 per day for delaying time per engineer. The seller should be responsible for the scene testing; After normal melting the seller should be responsible to guarantee repair or change of the faulty components in 6 months

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