I. The Importance of Selecting the Power of a Medium-Frequency Induction Furnace
As a core piece of equipment in modern metal smelting and heat treatment, the power of a medium-frequency induction furnace directly affects production efficiency, energy consumption, and equipment lifespan. A reasonable power configuration not only ensures that production needs are met but also avoids energy waste and excessive equipment wear and tear. Excessive power may lead to increased initial investment and operating costs, while insufficient power will fail to meet production demands, affecting product quality and production schedule. Therefore, scientifically and rationally selecting the power of a medium-frequency induction furnace is a crucial step in equipment selection.
II. Main Factors Affecting Power Selection
1. Characteristics of Melting Materials
Different metal materials have significantly different power requirements due to their different physical properties:
Melting Point Differences: The power requirements for melting aluminum (660°C) and steel (1500°C) differ greatly.
Specific Heat Capacity: Copper (0.385 J/g·°C) requires more precise power control than iron (0.449 J/g·°C).
Resistivity: Directly affects eddy current generation efficiency; the resistivity of stainless steel is approximately 5 times that of carbon steel.
2. Production Scale Requirements
Single Melting Capacity: The power configuration of a 1-ton furnace increases non-linearly compared to a 5-ton furnace.
Production Cycle Time: Rapid, continuous production requires higher power to shorten melting time.
Annual Production Planning: Long-term capacity planning should consider power redundancy design.
3. Power Supply and Grid Conditions
Transformer Capacity: A dedicated transformer is typically required for the electric furnace.
Voltage Level: Common voltage options include 380V, 660V, and 10kV.
Harmonic Mitigation: High-power equipment requires harmonic suppression devices.
III. Basic Methods of Power Calculation
1. Theoretical Calculation Method
Basic Power Calculation Formula:
P = (C×ΔT + L) × M / (η×t)
Where
P: Required power (kW)
C: Specific heat capacity of material (kJ/kg·°C)
ΔT: Temperature rise (°C)
L: Latent heat (kJ/kg)
M: Melting amount (kg)
η: Overall efficiency (typically 0.5-0.7)
t: Melting time (h)
2. Empirical Estimation Method
Empirical values for common metal smelting power:
Cast iron: 500-600kW/t
Cast steel: 600-700kW/t
Copper alloy: 400-500kW/t
Aluminum alloy: 300-400kW/t
