30t 16000kw Medium Frequency Steel Shell Induction Melting Furnace

• Customization: Available
• Place Style: Horizontal
• Range of Applications: Industrial
• Usage: Aluminum Die-casting
• Fuel: Electric
• Name: Induction Melting Furnace
• Capacity: 30t
• Power: 16000kw
• Type of Motor: Medium Frequency Steel Shell
• Transport Package: Polywood
• Specification: 30T 16000Kw induction melting furnace
• Trademark: SEMC
• Origin: Shanghai
• Production Capacity: 50000
• Package Size: 500.00cm * 700.00cm * 600.00cm
• Package Gross Weight: 50000.000kg

Product Description

30T medium frequency steel shell
induction melting furnace
30T medium frequency steel shell induction melting furnace

>> 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 9000KVA rectification transformer,
4 low voltage control cabinet, 4 16000KW/200HZ MF power supply cabinet, 2 30t MF
induction furnace, 1 hydraulic station, 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	30
Max load capacity	t	36
Rated power	kw	16000
Max coil in electric current	A	2700
Working frequency	Hz	150~ 200
Melting rate	t/h	20~23	1600ºC
Power consumption	kw.h/t	530~580	1600ºC
Inductor inner diameter	mm	Φ1900
height of inductor	mm	2700
Rated temperature of the melting steel	ºC	1600
Incoming voltage of MF cabinet	v	950
electric rectificate mode	24pulse
Voltage of inductor	V	3200~3400	Double voltag

cooling water pressure for power source	Mpa	0.1~0.2
Cooling water of the furnace	pressure of incoming water	Mpa	0.25~0.3
temperature of incoming water	ºC	≤5~35
temperature of the outlet water	ºC	≤55
) flow rate ( furnace body )	t/h	320	single furnace
flow rate (power source)	t/h	150
water temperature rise of power source	ºC	10
Hydrauic system	working pressure	Mpa	12	doublemotor, double pump
flow rate	L/min	190
hydraulic medium	antiwear hydraulic oil	N68 summer:N68  N46 winter:N46
diameter of the hydraulic cylinder	mm	Φ280
capacity of the transformer	KVA	20000
incoming voltage	KV	10kv20kv or 35kv
secondary voltage	V	950~ 1000

Products standard and Operating conditions
2.1 Products standard:

GB10067.3-1988 electroheat installations'

'Basic specifications for electroheat installations--Induction

GB10067.1-1988 'Basic specifications for electroheat installations-General'

GB10066.3-2004 furnaces'	'Test methods for electroheat installations--Coreless induction
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'
GB/ T4280-2004 'Coreless induction furnaces'

GB/ T8669-1997	'semiconductor frequency conversion devices for intermediate
frequency induction heating'
GB5226.1-2002 General requirements'	'Safety of machinery	Electrical equipment of machines

2.2 Operating conditions
2.2.1 Cooling water conditions
PH: 7- 8.5
Hardness: < 10 degree(s 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
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 Temperature 5~40ºC	< 1000m
Relative humidity	< 90% (>20ºC )

No electric and incentive atomy, no Explosive Gas and no caustic gas
Avoid strong shake and concussion.
Electrical Technique Instruction
Electrical parts of the equipment include rectification transformer, low-voltage
switch cabinet, intermediate frequency power cabinet, flat wave reactor, and compensation
capacitor bank and water tank.
3.1 Rectifying transformer
This equipment uses special-purpose rectification transformer, which transforms
35KV or the 10KV high voltage of the electrical network to 950V, which is suitable for the
solid power.
There is a no-load manual changer at the high voltage side of transformer , output
voltage can be adjusted at- 5% , 0, + 5% . It is used tosuit the deviation of grid. In order to
ensure the safety of silicon-controlled rectifier and avoid impact on the grid, this
transformer request the big short circuit resistance value 10%, simultaneously adds the
shielding layer between the original and vice-coils. There are a gas relay and the oil
thermometer on the power transformer, its output is chain-reacted with high-voltage switch
cabinet, when there appears the gas alarm or higer oil temperature, it will automaticlly turn
off the power.
Cooling of the Transformer uses the oil bath self-cooling.
3.2 Low-voltage switch cabinet
The low Voltage switch - automatic air circuit breaker (DW15) is installed
between the transformer output and the intermediate frequency power input, it is used in the
make-and-break and isolates the overhaul of intermediate frequency power source.
The air circuit breaker has fast broken load protection and the no voltage release
protection
3.3 Intermediate frequency power source
Controllable intermediate frequency power supply is AC-DC-AC equipment. It uses
silicon-controlled rectifier to change there-phase DC to single-phase AC. The equipment is
strongly adoptive to any load, and is widely used in metal fusion, heat treatment, and
crystal's growth.
1. The cabinet uses GGD cabinet structure, the arrangement of element is in one side,
which is easy to install and maintain, the way of refrigeration is water-cooling or
wind-cooling.
2. Rectifying Bridge (KP tube), contravariant Bridge (KK tube), Silicon-controlled
rectifier; those elements are all made by famous companies, the components of control
circuits are import, this guarantee its stability and reliability.
3. In the whole startup process, at any moment the loads change is traked by the
frequency adjustor system, circuit and voltage adjustor closed loop system, which leads to
the perfect, soft start-up. This way has less effect to controlled silicon and it extends its life.
Also, its characteristics such as thin, heavy load and easily start up.
4. The set's electric circuit uses our patent constant-power circuit. In the working
process, it can servile the change of voltage and electric current by itself, and base on this to
estimate the change of load. Automatically adjust the output power that let the equipment
always has the largest output power. Especially for fusion, this constant-power control can
realize power output as larger as possible. It improves fusion's speed efficiently.
5. No need for special surveillance. The machine only has one power switch and a
power adjuster knob. It is easily to be operated. After start, you only need to turn the power
to the largest position; others will work automatically. When increase large number of
material, the equipment can adjust the power itself. It won't stop suddenly as a result of
over current and over voltage.
6. As the fusion is fast and the thermal efficiency is high, once output is improved. It
always works under the highest volts dc (commutate a =0 ). So the input power factor is