DC Plasma Electric Arc Furnace Equipment Introduction

DC Plasma Electric Arc Furnace (DC PAF)

1. Core Principle & Equipment Structure

1.1 Working Principle

1. Arc ignition: A DC voltage is applied between the cerium-tungsten electrode of the plasma torch and the water-cooled copper nozzle. Argon gas is introduced, and a high-frequency igniter breaks down the gas to form a non-transferred arc (pilot arc).
2. Transfer: The torch is lowered to connect the arc with the bottom anode; the circuit switches to form a transferred arc (main arc) as the primary heat source.
3. Melting: The plasma arc temperature reaches 10,000–20,000 ℃, rapidly melting the charge. Inert gas can be used to control the atmosphere for non-oxidation or reduction smelting.

1.2 Main Components

• Plasma torch: Water-cooled cerium-tungsten electrode, copper nozzle, gas circuit
• Furnace system: Water-cooled furnace lid, refractory lining, bottom anode, electromagnetic stirring coil
• Power supply system: DC rectifier power supply, reactor, control system
• Auxiliary system: Gas supply, water cooling, hydraulic lifting

2. Key Technical Parameters

2.1 Electrical & Power Parameters

• Rated power: 500 kVA – 10 MVA+
• Input voltage: 380V / 690V / 6kV / 10kV
• Operating voltage: 500–800 V (DC)
• Operating current: Hundreds to thousands A
• Power factor: 0.70–0.86

2.2 Process & Atmosphere Parameters

• Arc core temperature: Up to 20,000 ℃
• Working gas: Argon, nitrogen, hydrogen
• Gas flow rate: 10–100 Nm³/h
• Vacuum degree (optional): 6.7×10⁻³ Pa

2.3 Cooling & Operation Parameters

• Cooling water flow: 50–160 m³/h
• Cooling water pressure: 2–4 bar
• Electrode lifting stroke: ≤ 150 mm
• Lining campaign life: ≥ 150 heats

3. Core Advantages

• Ultra-high temperature & high efficiency: Fast melting, low energy consumption
• Controllable atmosphere, no carburization: Suitable for ultra-low carbon steel
• High alloy recovery: ≥ 96%
• Grid-friendly: Stable arc, low harmonics, low grid impact

4. Typical Applications

• Special steel: stainless steel, bearing steel, superalloys
• Refractory metals: W, Mo, Ta, Nb, Zr, Ti
• Metal recycling & industrial waste treatment
• New materials: ceramics, composite materials

  Shaanxi Chengda Industrial Furnace Manufacturing Co., Ltd. is a high-tech enterprise specialized in the research, design, and manufacturing of various industrial furnaces, including AC and DC steelmaking electric arc furnaces, ladle refining furnaces, ferroalloy ore thermal furnaces, ferroalloy refining furnaces, electric slag remelting furnaces, non-standard metallurgical equipment, heat treatment equipment, and various related environmental protection dust removal equipment. The company's product design and manufacturing capabilities have reached 100 tons for electric arc furnaces, 160 tons for ladle refining furnaces, and a capacity range of 3600KVA to 35000KVA for ore thermal furnaces. In accordance with national industrial policies, we have designed high and low voltage compensation systems, dust removal systems, ferroalloy DC furnaces, and new energy equipment suitable for the actual operation of the equipment. For inquiries, please contact Mr. Du at 13991381852 or Mr. Chen

13709182307.