30t Induction melting furnace_Energy saving induction heating equipment manufacturers

Induction melting furnace is an efficient smelting equipment that melts scrap steel by electromagnetic induction heating. The energy conversion process is electro-magnetic-electric-heating, in particular, the power frequency power supply outputted by the rectifier transformer is converted into a single-phase AC power source matching the required frequency of the load in an AC-DC-AC mode, and is generated in the steel scrap in the furnace. High-strength magnetic field, the steel scrap in the furnace induces a strong electric field under the action of a magnetic field and forms an internal eddy current, thereby forming a heat source to melt itself. This heating method of generating thermal energy by itself inside the charge is an efficient way of melting.

The Induction melting furnace produced by our company has the following characteristics:

1 The input voltage is high and the output voltage is high. For the rated capacity of this program 30t Induction melting furnace, our company is designed according to the 1750V incoming line voltage specification, and the sensor load output voltage is nominally 6300V.

2 High melting rate. The rated design tonnage tapping amount is reached, and the continuous hot furnace smelting time is controlled at about 75 minutes.

3 tons of steel has low energy consumption. It is 5% lower than other manufacturers' equipment, which is better than the first-class standard in GB/T30839.31-2014 "Industrial electric heating device energy consumption: medium frequency centerless Induction melting furnace".

4 Digital, integrated, and highly automated. The company's power system control board is a digital chip type control board. The power amplifier board is an integrated control board integrating power amplification, vulnerability detection and output. The smelting management system realizes the monitoring and management of the entire equipment by using S7-300PLC+ high-equipped host as hardware and STEP7+WINCC as software.

2，Technical solutions and technical parameters

2.1， Technical solutions

For the 30t Induction melting furnace of this project, the company adopts the following technical solutions:

▷ Equipment configuration mode: one electric two furnaces. A furnace is normally smelted, and a furnace is used for furnace maintenance.

▷ Switching mode: mechanical change of furnace switch.

▷ Feeding method: The hydraulic feeding trolley on the platform is fed after the furnace.

▷The method of steel tapping: hydraulic tilting furnace, tapping nozzle and tapping steel tapping.

▷ Transformer: A single 24-pulse rectifier transformer is used.

▷Automatic control system: The hardware adopts S7-300 and configures industrial control computer.

The equipment system diagram is as follows:

高压开关柜：High voltage switchgear

整流变压器：Rectifier transformer

变频电源：Frequency change power

油浸电抗器：Oil immersion reactor

电容器组：Capacitor bank

机械换炉开关：Mechanical furnace change switch

炉体：Furnace body

液压站：Hydraulic station

2.2、Technical parameters

ITEM			UNIT	PARAMETER		REMARK
Basic parameters
Rated capacity			t		30
Max capacity			t		40	Depending on the furnace building process
Rated tapping temperature			℃		1600
Melting time			min		75±5%	Note1
Melting rate			t/h		23-25	Note1
Power consumption			KW·H/t		500±5%	Note1
Frequency change power
Rated power			KW		16000
Inlet voltage			V		1750	mid-gear
Rectification mode			P		24
Mid-frequency			HZ		150
Output voltage			V		6300
		Cyclic mode			Closed (internal and external double cycle)	Cooling water
		Pressure	MPa		0.1-0.12	Outlet≤0.05
		Flow	t/h		260
		Inlet temperature	℃		≤35
		Temperature raise	℃		≤8
Induction melting furnace body
Inner diameter of inductor			mm		φ1900
Height of inductor			mm		2900
Voltage of inductor			V		6300
	Cyclic mode				Closed (internal and external double cycle) ; Can choose to open	Cooling water
	Pressure		MPa		0.2-0.3
	Flow		t/h		450	Single furnace 300
	Inlet temperature		℃		≤40
	Temperature raise		℃		≤12
Hydraulic system
Working pressure			MPa		12
Hydraulic medium					Flame retardant anti-wear hydraulic oil N68
Diameter of cylinder			mm		280
Rectifier transformer (single set 24 pulses, with electrostatic shielding and secondary low voltage relay protection)
Rated capacity			KVA		21000
Reference model					ZSSP-21000/22 /1.75*4
First line voltage			KV		22	Reference temporarily
Second line voltage			V		1750	mid-gear
Impedance voltage					＞10%
Adjust voltage mode					Non-excitation voltage regulation
Cooling mode					Forced oil circulation water cooling
	Cyclic mode				Closed (internal and external double cycle)	Cooling water
	Pressure		MPa		0.1-0.12
	Flow		t/h		60
	Intlet temperature		℃		≤35
	Temperature raise		℃		≤8

NOTE 1:

Users working conditions:

Scrap steel yield ≥97%, hot, continuous, light and thin materials must be packaged into briquettes, large material cutting, with the use of pressing manipulator. Except for heat preservation and slag discharge time, based on the actual weighing of molten steel.