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{"title":"New Energy-saving DC Electric Arc Furnace","imgUrl":"https:\/\/img.chinax.com\/nimg\/cf\/f5\/035a4a42a806223939b676be641d-200x200-1\/new_energy_saving_dc_electric_arc_furnace.jpg","attrs":{"Brand Name":"Shaanxi Chengda","Model Number":"Negotiate based on equipment processing capacity","Certification":"ISO 9001","Place of Origin":"China"}}
{"title":"HX 3-Phase Steel Making Electric Arc Furnace for 5ton 8ton 10ton 15ton 20ton","imgUrl":"https:\/\/img.chinax.com\/nimg\/8e\/b9\/b685fcdf4b43d49502bf7932703e-200x200-1\/hx_3_phase_steel_making_electric_arc_furnace_for_5ton_8ton_10ton_15ton_20ton_30ton_50t_60t.jpg","attrs":{"Brand Name":"Shaanxi Chengda","Model Number":"Negotiate based on equipment processing capacity","Certification":"ISO9001","Place of Origin":"Xi 'an, China"}}
{"title":"Direct Current Arc Furnace Direct Current DC Arc Furnace For Metal Melting","imgUrl":"https:\/\/img.chinax.com\/nimg\/65\/41\/f44bef2b447750f46e55742c700d-200x200-1\/direct_current_arc_furnace_direct_current_dc_arc_furnace_for_metal_melting.jpg","attrs":{"Brand Name":"Shaanxi Chengda","Model Number":"Negotiate based on equipment processing capacity","Certification":"ISO9001","Place of Origin":"Shaanxi, China"}}
{"title":"High Capacity Electric Arc Furnace For Batch Or Continuous Operation 50-300 Tons","imgUrl":"https:\/\/img.chinax.com\/nimg\/51\/60\/29a3ab3dcba73d293ddea5e99e85-200x200-1\/high_capacity_electric_arc_furnace_for_batch_or_continuous_operation_50_300_tons.jpg","attrs":{"Brand Name":"Shaanxi Chengda","Model Number":"Negotiate based on equipment processing capacity","Certification":"ISO9001","Place of Origin":"China"}}
{"title":"Ladle Refining Furnace (New)","imgUrl":"https:\/\/img.chinax.com\/nimg\/23\/6f\/560061bdcfde837960e560f75f11-200x200-1\/ladle_refining_furnace_28new_29.jpg","attrs":{"Brand Name":"Shaanxi Chengda","Model Number":"Negotiate based on equipment processing capacity","Certification":"ISO9001","Place of Origin":"Shaanxi, China"}}
{"title":"Special Alloy Smelting Furnace with ISO 9001 Certification","imgUrl":"https:\/\/img.chinax.com\/nimg\/cd\/a2\/d50cf01eb3663830417fbdb8c146-200x200-1\/special_alloy_smelting_furnace_with_iso_9001_certification.jpg","attrs":{"Brand Name":"Shaanxi Chengda","Model Number":"Negotiate based on equipment processing capacity","Certification":"ISO9001","Place of Origin":"Shaanxi, China"}}
{"title":"Dc Steel-Making Electric Arc Furnace with 5t 10t 50t 100t","imgUrl":"https:\/\/img.chinax.com\/nimg\/8e\/b9\/b685fcdf4b43d49502bf7932703e-200x200-1\/dc_steel_making_electric_arc_furnace_with_5t_10t_50t_100t.jpg","attrs":{"Brand Name":"Shaanxi Chengda","Model Number":"Negotiate based on equipment processing capacity","Certification":"ISO9001","Place of Origin":"Shaanxi, China"}}
The new energy-saving DC electric arc furnace consists of seven core modules: furnace body, IGBT/thyristor rectifier power supply system, top graphite electrode, bottom conductive anode, water cooling system, hydraulic tilting mechanism and PLC intelligent control system.
Electrode Configuration: The mainstream design adopts single top graphite electrode plus furnace bottom anode; the updated dual-electrode design without bottom anode effectively avoids furnace bottom burn-through. Compared with 3-electrode layout of AC furnaces, the electrode auxiliary structure is greatly simplified.
Power Supply Upgrade: The latest generation is equipped with IGBT flexible rectifier power supply, an upgraded version of traditional thyristor power supply. It realizes full-digital closed-loop regulation, stepless voltage & current adjustment and online polarity switching without shutdown, supporting both submerged-arc and open-arc smelting modes for dual-purpose of arc furnace and submerged arc furnace.
Intelligent Automatic Control: The PLC system enables one-key switching among constant power / constant current / constant voltage smelting modes. Soft start prevents power grid impact, with full protection against overvoltage, overcurrent, phase loss and overtemperature.
2. Core Energy-saving Technical Indicators (vs. Conventional 3-phase AC EAF)
Items
Energy-saving Index
Technical Description
Power Consumption
10%～15% electricity saving
No alternating eddy current loss; power factor reaches 0.95~0.98 (0.7~0.9 for AC furnace requiring extra reactive power compensation), no extra power loss from arc extinction at zero-crossing current
Graphite Electrode Consumption
30%~50% consumption reduction
Free of alternating current skin effect; concentrated arc avoids furnace wall sweeping; side oxidation accounts for over 44% of total electrode loss on AC furnaces
Refractory Lining
Service life extended over 30%
DC arc deflection only 12° versus 45° of AC arc; arc rarely scours furnace lining with no local overheating hot spots
Production Efficiency
Tap-to-tap cycle shortened by 8%~12%
Self-generated electromagnetic stirring homogenizes molten steel temperature and composition for faster tapping; advanced furnaces achieve power consumption as low as 300kWh per ton of molten steel
Noise & Power Quality
Noise reduced by 10~20dB; harmonic & flicker cut in half
Balanced three-phase input minimizes grid disturbance and eliminates demand for large-capacity filter devices
3. Fundamental Energy-saving Mechanism
Reduced Circuit Loss: Alternating current induces alternating magnetic field and eddy heat loss; constant DC magnetic field eliminates eddy heating on short-net cables to cut invalid power waste.
Stable Arc Combustion: DC current has no zero-cross point, maintaining continuous arc without intermittent extinction to improve thermal efficiency via concentrated directional heat input.
Built-in Electromagnetic Stirring: DC current forms fixed-direction magnetic field to drive circulating molten bath, eliminating extra power-consuming external electromagnetic stirring equipment and accelerating raw material melting.
Flexible Power Regulation: Modular IGBT rectifier outputs precise power on demand; intelligent current limiting during scrap collapse and impact-free arc reignition prevent instantaneous peak power waste.
4. Applicable Smelting Materials
Ferrous Metallurgy: Scrap steel melting for carbon steel, stainless steel, alloy steel, bearing steel, die steel and pig iron production; short-process EAF steelmaking cuts around 1.6 tons of CO₂ emission per ton of scrap processed.
Ferroalloy & Non-ferrous Metallurgy: Production of ferrosilicon, ferrochrome, ferromanganese, calcium aluminate, red mud-based iron smelting and precious metal refining.
Solid Waste Recycling: Melting treatment of fly ash, metallurgical slag and hazardous solid waste for resource recovery, realizing multi-purpose single equipment.
5. New-generation Technical Advantages
Reversible Polarity Technology: Real-time anode-cathode switching during smelting evens out furnace temperature distribution to eliminate overheating or cold zones, further lowering power consumption and improving finished product yield.
Integrated Scrap Preheating System: Flue gas waste heat recovers to preheat incoming scrap, saving another 20~35kWh power per ton of steel.
Digital Smelting Control: Real-time collection of arc voltage, arc current and furnace temperature data; AI self-adaptive power curve optimizes energy consumption to comply with low-carbon steelmaking policies.
6. Application Advantages & Industry Trend
Capital & O&M Cost: Lower investment on matching electrodes, short-net cables and reactive power compensation facilities; comprehensive operating cost 18%~25% less than conventional AC furnaces.
Policy Compliance: Short-process EAF steelmaking is core route for domestic low-carbon steel transformation; energy-saving DC furnaces are prioritized for scrap recycling and dual-carbon compliant projects in special steel & renewable metallurgy sectors.
Full Size Range: Complete product lineup from 0.5t lab-scale furnace, 5t/10t/20t industrial furnace up to hundred-ton large-scale steelmaking furnace.
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, ferroall... 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, ferroall...
