Dalian Heavy Industry’s First Sealed DC Furnace Successfully Commissioned, Achieves Breakthrough in Intelligent Smelting Technology

Recently, the first independently developed sealed DC furnace by Dalian Heavy Industry Equipment Group was successfully commissioned at the Guangxi Chiji Steel production base, achieving iron tapping one and a half months ahead of schedule, with the first furnace producing 64.46 tons of Manganese Silicon Alloy. After half a month of trial production, the equipment’s daily output stabilized at 200 tons, with average daily power consumption controlled within 3600 kWh/t. Key indicators, including element recovery rate, are at industry-leading levels, fully meeting design specifications. This milestone represents a breakthrough for Dalian Heavy Industry in the field of sealed DC metallurgical furnaces.

According to the introduction, this sealed direct current furnace integrates three major innovative technologies: fully sealed direct current smelting technology, which, through the development of differential arrangement copper busbar technology and direct current furnace sealing technology, has created a direct current metallurgical furnace without fixed anodes, achieving an equipment stable operation rate exceeding 98%, increasing element recovery rate by 3%, and reducing smelting power consumption by 5% compared to domestic advanced standards. Multi-pulse rectification technology utilizes a configuration of two rectifier transformers paired with four rectifier cabinets, forming an equivalent 24-pulse rectification system that effectively reduces pollution to the power grid. The dual independent system design perfectly aligns with Guangxi's peak-valley electricity pricing policy, enabling highly efficient electrical energy utilization. The intelligent control technology integrates three control modes: rectifier tap adjustment, rectifier cabinet trigger angle control, and electrode position lifting, forming a comprehensive intelligent control system. It features a constant power operation function and supports zero-load start-up, significantly reducing grid impact and operational complexity.