Blast Furnace Gas Cleaning Plant

The primary aim of blast furnace gas-cleaning plant solutions by Primetals Technologies is to help steelmakers safely and sustainably reduce waste. This goal is accomplished through a comprehensive understanding of gas-cleaning plants and the processes associated with blast furnaces. The expertise in design and operation, combined with experience in modern technologies, enables Primetals Technologies to offer gas-cleaning plants for blast furnaces that exceed current environmental standards and minimize operational and maintenance challenges.

With a complete portfolio of gas-cleaning plants offering both wet and dry solutions, Primetals Technologies provides optimized systems that maximize energy recovery for blast furnaces. The Tri-Ax cyclone solution, boasting an impressive 85% efficiency, is specifically designed to manage dry dusts effectively within the plant. Wet scrubbing systems provide reliable, low-maintenance gas cleaning and precise control of blast furnace top pressure, seamlessly integrating with new or existing downstream energy recovery systems. This comprehensive approach ensures long-lasting and profitable furnace operations.

Key features of the gas cleaning plant include an off-gas system with uptakes and downcomers, patented single and triple tangential inlet cyclones with an optimized bypass system, and single and triple Davy Cone Scrubbers. Options for both internal and external demisters are available across all scrubber variants, enhancing the plant's adaptability and effectiveness.

Long-Life Gas Cleaning Plant for Blast Furnaces That Requires Low Maintenance

The patented Tri-Ax Cyclone by Primetals Technologies ensures safe and reliable dust collection as the first stage of the gas cleaning plant. Traditionally, dry dust collection downstream of the blast furnace was managed by a gravity dust catcher. However, recent environmental considerations have led to an increase in the use of cyclone-type dust collectors, which operate at efficiencies of 85% or higher. This shift significantly reduces sludge generation at the water treatment plant, preventing excessive landfill waste. In the final stage, the gas enters a scrubbing vessel, where it is saturated and cooled by water in the spray tower, removing the bulk of the dust. The Davy Cone Scrubber completes the dust removal process, achieving an outlet dust concentration of less than 5 mg/Nm³ and a free moisture level in the gas stream of below 5 g/Nm³. Finally, a demisting device removes the remaining moisture, allowing clean fuel gas to be used downstream.

Benefits of the Gas Cleaning Plant for Blast Furnaces

• Enhanced material recovery and efficiency: increased recovery of ferrous and carbon fines at the cyclone, facilitating recycling to the sinter plant and reducing sludge loading at the water treatment plant.
• Operational reliability and safety: minimized downtime and improved safety with modern water level control systems, supported by a maintenance-friendly design with multiple cones for redundancy.
• Optimized environmental performance: reduced dust and moisture carryover, ensuring dust-free emissions through a novel dust discharge system and reduced spray requirements.
• Energy recovery and integration: increased energy recovery at the top gas recovery turbine (TRT) by utilizing alternative waste streams, with perfect synergy and integration with downstream equipment.
• Flexible and adaptive design: features such as a tunable bypass arrangement enhance adaptability and efficiency, aligning with specific operational needs.