Heat Treatment & Special Applications
Green Furnace
The Green Furnace: Our popular low-frequency model has been further improved upon leading to furnace orders of 19MTPA capacity out of which 6 MTPA are orders of plants using furnaces of other makes. Some of the largest secondary steel manufacturers globally are joining the Green revolution. Below are the reasons why…
Topology Comparison
| SERIES | PHASE LOCK | PHASE TUNE | PHASE SMART |
|---|---|---|---|
| Power Range | 3000 kW – 24000 kW | 600 kW – 3000 kW | 30 kW – 600 kW |
| Frequency Range | 150 Hz – 600 Hz | 300 Hz – 3000 Hz | 300 Hz – 300 KHz |
| Input Voltage | 11 kV – 33 kV | 11 kV – 33 kV | 380 V – 480 V |
| High power pickup and best melt rate due to voltage boosting and low-power consumption | High power pickup and best melt rate due to voltage boosting and low-power consumption | High power pickup and best melt rate due to voltage boosting and low-power consumption | High power pickup and best melt rate due to voltage boosting and low-power consumption |
| 97% – 98% (from 40% of rated power using CPF system) | 97% – 98% (from 40% of rated power using CPF system) | 97% – 98% (from 40% of rated power using CPF system) | 97% – 98% (from 40% of rated power using CPF system) |
| High power pickup and best melt rate due to voltage boosting and low-power consumption | High power pickup and best melt rate due to voltage boosting and low-power consumption | High power pickup and best melt rate due to voltage boosting and low-power consumption | High power pickup and best melt rate due to voltage boosting and low-power consumption |
| 97% – 98% (from 40% of rated power using CPF system) | 97% – 98% (from 40% of rated power using CPF system) | 97% – 98% (from 40% of rated power using CPF system) | 97% – 98% (from 40% of rated power using CPF system) |
Features of Green Furnace & Impact on Performance
| Series Circuit | Parallel Circuit | Green Furnace | |
|---|---|---|---|
| Name | Voltage Source Inverter | Current Source Inverter | Voltage-Boosted Current Source Inverter |
| Power Pickup & melt rate | Good power pickup and high melt rate | Poor power pickup. Low melt rate | High power pickup and best melt rate due to voltage boosting and low-power consumption |
| Power Factor | 96% – 97% (from start) | Max 93% – 94% (from 80% of rated power) | 97% – 98% (from 40% of rated power using CPF system) |
| Capacitor Switching & frequency | Switching is not required. Low frequency maintained throughout the heat cycle | Switching Required. Done via PLC-controlled pneumatics. Medium freq due to the large frequency range | Switching is not required. Low frequency maintained throughout |
| Energy Consumption | Higher than Green | Higher than Green | Lowest due to 8 Green furnace features |
| After-sales parts cost | Expensive due to high current carrying devices | Cheaper than a series circuit | Cheaper than a series circuit |
| Reliability (Shock load and short circuit resilience) | Poor due to the presence of a DC link discharge capacitor | Better due to the presence of heavy current sourcing DC reactor | Better due to the presence of heavy current sourcing DC reactor |
| 2% | 2% | 2% | 2% |
| 1% | 1% | 1% | 1% |
End Result
Feature 6 and 7 explained
Load Graph 18th Heat 14.5 MW with Voltage Stretching
LOAD FACTOR – 95%
Load Graph without Voltage Boosting
LOAD FACTOR – <90%
Feature No. 2: Nano Cable Design
