Technical Parameters of Low Frequency 20 T Induction Melting Furnace
The 20 T induction melting furnace is an energy-saving induction melting furnace. According to the difference of inverter resonance, it is divided into ordinary classic line 20 T parallel induction melting furnace and 20 T one-to-two induction melting furnace . The 20 T induction melting furnace is composed of a 12-pulse intermediate frequency power supply, It consists of two 20 T steel shell furnace bodies, a hydraulic tilting furnace, and a complete set of water cooling systems.
1. Ordinary classic line 20 T parallel induction melting furnace
One set of 20 T parallel induction melting furnace with a power of 10000 kw is equipped with two 20 T melting furnaces. Use two 5000KVA special rectifier transformers for 10000KW, 12-pulse intermediate frequency power supply.
Main technical parameter requirements of ordinary parallel 20T/10000KW induction melting furnace
|
Serial number |
Term project |
Reference number |
Preparation Note |
|
1 |
Power incoming line voltage |
1050V , 50Hz |
User grid voltage 35KV |
|
2 |
Rated Capacity |
20T |
10000KW power melting and heat preservation |
|
3 |
rated power |
10000KW |
12-phase 24-pulse control system |
|
4 |
Rated intermediate frequency |
350 Hz |
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|
5 |
Rated temperature |
1700°C |
|
|
6 |
Melting rate |
About 10T/H |
Continuous use of melting furnace |
|
7 |
Unit power consumption |
Melting about 550-600kwh/T |
Continuous use of melting furnace |
|
8 |
Power cooling circulating water consumption |
35T/H |
Continuous use of melting furnace |
|
Circulating water consumption of furnace cooling |
30T/H |
Continuous use of melting furnace |
|
|
9 |
Hydraulic station capacity |
200 L |
|
|
10 |
Transformer model |
ZSS -6300 /10KV/1250x2 |
Dedicated rectifier transformer (for 6000KW) |
|
11 |
Hydraulic medium |
No. 46 hydraulic oil |
|
|
12 |
Water supply pressure |
0.2-0.3 MPa |
To the position of the furnace port |
|
13 |
Working pressure of hydraulic station |
15 MPa |
Z height 18 MPa |
|
14 |
Inlet water temperature |
35°C |
|
|
15 |
Outlet temperature |
55°C |
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20T / 10000KW parallel induction melting furnace consisting of
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The composition of a set of 20T/10000KW parallel induction melting furnace |
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Order No. |
Name called |
Model and remarks |
Quantity |
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|
1 |
IF power supply cabinet |
10000KW with 20 T furnace |
1 set |
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2 |
Capacitor bank |
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3 |
Leaking furnace alarm device |
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4 |
Furnace body (including: oil cylinder, iron core, bracket, induction coil, etc. ) |
20T melting furnace body |
2 sets |
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5 |
Crucible mold |
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6 |
Water-cooled cable |
Water-cooled cable side outlet |
2 sets |
|
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7 |
Hydraulic station system |
|
1 set |
|
|
8 |
Tilting furnace console |
|
1 set |
|
|
9 |
Equipment technical drawings |
|
1 set |
|
|
10 |
Equipment instruction manual |
|
1 set |
|
|
11 |
Certificate of conformity and inspection report |
|
1 set |
|
Remarks:
1) Use 12-phase 24-pulse double rectification control system.
2) The use of a fully enclosed cooling tower can improve the cooling effect of the system and the service life of the equipment, without the need to build a pool.
Main components of 20T/10000KW parallel induction melting furnace
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1. Power supply cabinet: |
⑴Main circuit breaker |
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⑵ Rectifier SCR |
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⑶Inverter SCR |
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⑷Main control board |
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⑸Buttons , indicator lights, etc. |
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⑹Resistance and capacitance to protect thyristor |
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⑺ Copper |
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2. Electric heating capacitor |
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3. Stove |
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⑵Silicon steel sheet |
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⑶Hydraulic cylinder |
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4. Hydraulic system |
⑴Hydraulic components |
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⑵Oil pump |
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⑶ Motor |
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5. Transformer (optional) |
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6. Waterway system |
(1) FBT closed cooling tower |
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(2) Water pipes and hoses |
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(3) Pipeline valves and others |
2. Progressive line super fast energy-saving series line
20 is T one with two induction melting furnace is 20 is T series inverter electric furnace, with two medium frequency induction melting furnace at the same time can also be an induction melting furnace smelting, the other an induction melting furnace may be required to control the casting temperature Or keep warm. (It is called a 20 T induction melting furnace with one for two ). The user can choose according to the needs.
Our company designed a set of 12000kw intermediate frequency power supply with two 20 T smelting furnaces. Two 6300KVA dedicated 12-pulse rectifier transformers are used for 12000KW intermediate frequency power supply, and the power supply is a 24-pulse intermediate frequency power supply.
Main technical parameter configuration of 20 T one to two induction melting furnace
|
project |
unit |
data |
|
Electric furnace parameters |
T |
20t |
|
Rated Capacity |
t |
20 |
|
Z large capacity |
t |
twenty one |
|
Z high working temperature |
°C |
1800 |
|
Transformer capacity |
KVA |
Two 6300KVA units in parallel |
|
Transformer primary voltage |
KV |
10 |
|
Transformer secondary voltage |
V |
1250 |
|
Rated power of intermediate frequency power supply |
KW |
12000kw melting furnace power 10000kw, holding furnace 2000kw, power adjustable |
|
Coil voltage |
V |
3000 |
|
Rated working frequency |
Hz |
300 |
|
Power conversion efficiency |
% |
96 |
|
Startup success rate |
% |
100 |
|
Comprehensive parameters |
|
|
|
Equipment power factor |
|
≥0.96 |
|
Melting rate (heating up to 1800 ℃) |
t/h |
15 |
|
Melting power consumption (heating up to 1800 ℃) |
KW.h/t |
550 |
|
Working noise |
db |
≤75 |
|
Hydraulic system |
|
|
|
Hydraulic station capacity |
L |
800 |
|
Work pressure |
MPa |
15 |
|
Hydraulic medium |
|
Hydraulic oil |
|
Cooling water system |
|
|
|
flow |
M3/h |
150 |
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Water supply pressure |
MPa |
0.2～0.3 |
|
Inlet water temperature |
°C |
5～35 |
|
Outlet temperature |
°C |
35～55 |
|
Leaking furnace alarm device |
|
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20 T one to two induction melting furnace rectifier transformer
The rectifier transformer is used to reduce the primary high voltage to the input voltage suitable for the intermediate frequency power supply. It adopts a special high impedance oil-immersed self-cooling rectifier transformer, and the S11 type high-efficiency three-phase oil-immersed distribution transformer 6300KVA
This kind of rectifier transformer generally adopts Y/d11, Y0 connection group mode, and the secondary output is two groups, one of which is Y-connected, and the other is d11-connected, so that the phases of the two sets of output will be A difference of 30° from each other forms a 12-pulse rectification method. Compared with six-pulse rectification, this rectification method can effectively suppress the 5th and 7th harmonics and reduce the interference of harmonic components to the power grid. Therefore, this rectifier transformer is used in large electric furnaces.
Parameters of 12-pulse rectifier power transformer:
|
Electric furnace capacity (t) |
Intermediate frequency power (KW) |
Transformer capacity (KVA) |
Voltage combination |
Connection group label |
Impedance voltage (%) |
|
|
Primary side (KV) |
Secondary side (V) |
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|
20 |
6000 |
6300 |
10 |
1250 |
Y/d11, Y0 |
6～8 |
Note: There should be an off-load voltage regulating switch on the high-voltage side of the transformer, and the voltage should be adjusted in five levels of -10%, -5%, 0, +5%, and +10%.
20 T one to two induction melting furnace water cooling device
It is recommended to use Fbt-150 closed circulating cooling tower for power supply, and Fbt-200 closed circulating cooling tower for electric furnace, which can save a lot of production space and floor space.
