3 T induction melting furnace technical parameters and configuration instructions
Technical parameters of 3 T induction melting furnace
1. Technical parameters of thyristor intermediate frequency power supply
|
Serial number |
project |
parameter |
unit |
Remarks |
|
1 |
Power supply rated power |
2000+500 |
Kw |
Both smelt and heat preservation |
|
2 |
Power unidirectional Z high power |
2000 |
Kw |
Single power supply |
|
3 |
Power input voltage |
950 |
V |
|
|
4 |
Rectifier form |
12 pulse |
|
|
|
5 |
Grid side power factor |
>0.96 |
|
Under any power situation |
|
6 |
Inverter form |
Thyristor series |
|
Dual power supply |
|
7 |
Inverter output frequency |
400 |
Hz |
|
|
8 |
Startup success rate |
100% |
|
in any circumstances |
|
9 |
Power conversion efficiency |
0.97 |
|
|
|
10 |
Power consumption |
550±5% |
Kwh/t |
Melting from normal temperature in hot state to 1450℃ |
2. Induction furnace body
|
Serial number |
project |
parameter |
unit |
Remarks |
|
1 |
Rated capacity of single furnace |
3 |
t |
|
|
2 |
Large capacity of single furnace Z |
3.3 |
t |
|
|
3 |
Rated working temperature |
1800 |
°C |
|
|
4 |
Lining thickness |
110 |
mm |
|
|
5 |
Melting material |
Cast iron, cast steel |
|
Melting from normal temperature in hot state to 1800℃ |
Three, 3 T induction melting furnace configuration instructions
The circuit adopts 12-pulse rectification, and the incoming line voltage adopts 950V. The inverter adopts a half-bridge inverter. The intermediate frequency power supply of this line is suitable for electric furnaces with larger capacity and power between 2000KW and 10000KW. The circuit schematic diagram is as follows:
Structure principle of 12-pulse intermediate frequency power supply:
A. The thyristor of the rectifier part adopts Z's new stacked radiator assembly. This installation method makes the disassembly and assembly of the thyristor more convenient and scientific. When replacing the thyristor, just loose a top tight Bolt, you can replace any SCR component in the assembly. There is a scale on the radiator assembly for reference when tightening, which can ensure the correct pressing force between the thyristor and the radiator. Moreover, this installation method sufficiently reduces the volume of the SCR component and increases the operating space in the electrical cabinet.
B. Large-capacity DC filter capacitor
The filter capacitor is very important for solid power supplies. It can make the output voltage of the rectifier smooth and stable, provide a stable and smooth voltage for the inverter, and make the inverter waveform stable and reliable.
C. The inverter circuit adopts large-capacity fast thyristor and freewheeling diode
In order to ensure the reliable operation of the inverter and reliable freewheeling, the inverter thyristor and freewheeling diode adopt large-capacity KK thyristor and fast diode.
D. Convenient power conversion function
Only by rotating the power conversion potentiometer on the panel, the power conversion between the two furnace bodies can be realized. To achieve the effect of one furnace body melting the other furnace body heat preservation or two furnaces smelting at the same time. It can also be smelted in one furnace. The other furnace shuts down.
3 T induction melting furnace body description
The electric furnace part includes the electric furnace body, water-cooled cable, refractory cement, lining quick push-out device, and main circuit copper bar.
The furnace body is composed of induction coil, magnetic yoke, furnace frame, tilting cylinder (holding furnace and furnace cover).
The induction coil adopts TU1 type grade (purity is 99.97% electrolytic copper), the error of the turn spacing is not more than 2mm, and the coil assembly needs to undergo stress cancellation after welding.
The yoke is made of cold-rolled silicon steel sheet with high permeability. The thickness of the silicon steel sheet is 0.3 mm. The yoke adopts a profiling structure, and the arc of the inner arc is the same as the arc of the outer circle of the induction coil, so that the yoke can be evenly distributed on the outside of the induction coil, and the Z limit restrains the coil's outward radiated magnetic field and reduces the external magnetism. Road reluctance.
The furnace frame is divided into two parts: movable and fixed.
The movable furnace frame is used to install the induction coil and the magnetic yoke. It is welded by section steel and steel plate, and adopts a frame structure for easy maintenance. The operating platform on the top of the movable grate adopts thickened steel plates to improve the strength and load-bearing capacity of the grate.
The fixed furnace frame is installed on the foundation to carry the movable furnace frame. The upper part of the fixed grate is connected to the movable grate through a tilting shaft, and the movable grate can be tilted forward by 95 degrees under the push of the tilting oil cylinder.
The connector of the water-cooled cable adopts a detachable structure, which can be easily disassembled. The inside is connected to the copper stranded wire by welding. In this way, the connection is firm and the contact resistance is small.
Refractory mortar is a highly insulating and heat-insulating material, which is applied between the turns and the inner side of the induction coil
The lining quick push-out device is used to quickly remove the old lining. It includes a jacking block, a jacking cylinder and an operating mechanism.
