Secondary Dedusting Systems for Steel Plants

The Secondary Dedusting System (SDS) is a vital innovation for tackling the persistent challenges of dust emissions in steel plants. Steel producers often struggle to maintain clean and safe working environments, especially during the handling and processing of hot metal and liquid steel. The Secondary Dedusting Systems (SDS) for steelmaking from Primetals Technologies is designed to efficiently capture these emissions, ensuring superior dust collection and ambient cleanliness both inside and outside the steel shop. This system is crucial for creating a safe and productive workplace, as it addresses the stringent environmental regulations faced by the industry today.

The Secondary Dedusting System (SDS) is designed to capture dust across various stages of steel production efficiently.

A key feature of the Secondary Dedusting System (SDS) is the strategic design and placement of fume hoods, which maximize dust collection efficiency. These hoods vary in size depending on the application; for example, large roof canopies capture fumes during processes like electric arc furnace charging, while smaller hoods are used at raw material transfer points within material handling stations.

Each suction point is regulated by electrically driven control dampers, ensuring efficient dust capture according to preset values. In LD Converter (BOF) Secondary Dedusting Systems (SDS), static coolers can be integrated into the suction ducts to reduce peak temperatures during hot metal charging. This not only enhances efficiency but also reduces the thermal load on downstream equipment, thereby lowering energy consumption and operational costs.

Once captured, dust-laden fumes travel through ducts to the mixing duct, where they may be combined with off-gas from the primary dedusting system for additional cooling. This approach is commonly used in electric arc furnaces (EAF) and AOD converter applications.

Downstream of the mixing duct, the pulse jet filter system removes dust from the gas stream. The filtered dust falls into collection hoppers and is transported to dust bins using a mechanical dust-handling system. The cleaned gas is then conveyed via the clean gas duct to the exhaust stack, where it is safely released into the atmosphere.

To maintain the necessary suction force, ID fans are used. For noise control, these fans are enclosed, and a silencer is installed at the base of the stack to minimize sound emissions further.

Applications of the Secondary Dedusting System (SDS)

SDS can be applied in various steel production processes, including:

• Agglomeration processes (sintering/pelletizing) – room dedusting
• Blast furnace casthouse and stockhouse dedusting
• LD converter (BOF) secondary dedusting
• Electric arc furnace (EAF) secondary dedusting, either standalone or combined with primary dedusting
• AOD converter secondary dedusting, either standalone or combined with primary dedusting
• Caster secondary dedusting

This system ensures compliance with environmental standards while improving plant efficiency and workplace air quality.

Benefits of Secondary Dedusting Systems (SDS)

• Achieve superior dust collection: efficiently captures dust emissions, enhancing air quality and ensuring compliance with environmental regulations.
• Enhance safety: maintains clean ambient conditions, promoting a safer working environment for plant personnel.
• Optimize energy use: reduce power requirements by minimizing pressure losses, resulting in lower energy consumption and operational costs.
• Extend equipment life: increases the lifespan of filter bags through advanced filtration technology, reducing maintenance needs and downtime.
• Integrate seamlessly: combines with existing systems for comprehensive off-gas treatment solutions, offering a unified approach to emission control.