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

Dalian Heavy Industry Equipment Group recently successfully commissioned its first independently developed sealed DC furnace at the Guangxi Chiji Steel production base, achieving iron tapping one and a half months ahead of schedule and 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 usage kept at 3600 kWh/t. Key performance measures, such as element recovery rate, are industry-leading and fully fulfill design specifications. This achievement represents a significant accomplishment for Dalian Heavy Industry in the realm of sealed DC metallurgical furnaces.

According to the introduction, this sealed direct current furnace has three important unique innovations: fully sealed direct current smelting technology, which has produced 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% in comparison to domestic advanced standards. This is achieved through the development of differential arrangement copper busbar technology and direct current furnace sealing technology.Multi-pulse rectification technology employs a combination of two rectifier transformers and four rectifier cabinets to create an equal 24-pulse rectification system that successfully decreases pollution to the power grid. The twin independent system design is precisely aligned with Guangxi's peak-valley electricity price regulation, resulting in extremely efficient electrical energy consumption. The intelligent control technology includes three control modes: rectifier tap adjustment, rectifier cabinet trigger angle control, and electrode position raising, resulting in a comprehensive intelligent control system. It has a continuous power operation capability and provides zero-load start-up, which considerably reduces grid impact and operational complexity.