What centrifugal fans are used in the steel industry?

Centrifugal fans in the steel industry are characterized by high pressure, high temperature, wear resistance, and large airflow. Based on process applications, they are categorized into six major types: blast furnace air supply, sintering main exhaust, converter dust removal, gas pressurization, dry quenching circulation, and dust removal ventilation. The mainstream models include multi-stage centrifugal blowers, single-stage high-speed centrifugal fans, 9-19/9-26 high-pressure centrifugal fans, sintering main exhaust centrifugal fans, and high-temperature/wear-resistant specialty centrifugal fans. In recent years, magnetic levitation/air-suspension centrifugal fans have increasingly replaced traditional designs.
I. Classification by Process Application (Core Models)
1. Blast Furnace System (Ironmaking Core)
Blast furnace blowers (multi-stage centrifugal blowers / single-stage high-speed centrifugal)
Supply high-pressure combustion air to blast furnaces/hot blast stoves, with pressure ratios of 2.5–7.7 and flow rates of 65–1050×10³ Nm³/h. Primarily multi-stage centrifugal or single-stage high-speed types; adjustable vane (AV series) models offer enhanced energy efficiency.
Blast Furnace Gas Compression Blower
Conveys blast furnace gas; features high-temperature resistance (≤500°C), wear resistance, and explosion-proof design. Commonly employs 9-26 series, multi-stage centrifugal type.
2. Sintering Process (Raw Material Pre-treatment)
Sintering Main Exhaust Centrifugal Blower (ASJ Series, F-Type Double-Suction)
Core component of sintering machines, featuring high flow rates, high negative pressure, and wear resistance. Flow rates up to 1 million m³/h. Double-suction design with wear-resistant impellers/liners.
Sintering Dust Removal / Desulfurization Boosting Fans
Extract sintering flue gas and provide desulfurization boosting. Wear-resistant, temperature-resistant, and corrosion-resistant.
3. Steelmaking System (Converter / Electric Furnace)
Converter Primary Dust Removal Fan (High-Pressure Centrifugal)
Extracts high-temperature converter flue gas (800–1000°C). 9-19/9-26 high-pressure centrifugal or multi-stage centrifugal design. High-temperature resistant, wear-resistant, explosion-proof.
Converter Gas Recovery / Pressurization Fan
Recovers and pressurizes converter gas. Explosion-proof, wear-resistant, reliable sealing.
4. Coking / Dry Quenching
Dry Quenching Circulation Fan
Circulates inert gas in dry quenching systems. High-temperature resistant (≤600°C), wear-resistant, thermal shock resistant.
Coke Oven Gas Pressurization / Dust Removal Fan
Sulfur corrosion resistant, wear-resistant, explosion-proof.
5. General Dust Removal / Ventilation / Combustion Support
Dust Removal Centrifugal Fans (4-72, YFBC Series)
Workshop / Environmental dust removal, wear-resistant, corrosion-resistant, stainless steel impellers.
Combustion Support / Cooling Fans
Industrial furnace combustion support, equipment cooling, medium-low pressure, high flow rate.
6. New High-Efficiency Energy-Saving Fans (Mainstream Replacement)
Magnetic Levitation / Air-Suspension Centrifugal Blowers
High efficiency, oil-free, low noise, long service life. Used for blast furnace air supply, gas pressurization, dust removal, desulfurization. Energy savings of 20%–40%.
II. Mainstream Models and Selection Criteria
1. Common Model Series
9-19, 9-26 High-Pressure Centrifugal Fans: Converter oxygen supply, gas pressurization, high-pressure dust removal. High pressure, high efficiency.
F-Type Single/Double-Suction Centrifugal Fans: Main exhaust for sintering plants, blast furnace air supply. High flow rate, high-temperature resistance.
Multi-Stage Centrifugal Blowers: Blast furnace air supply, high-pressure gas conveyance. High pressure ratio, stable flow.
ASJ Series Main Exhaust Fans: Specialized for sintering plants. Wear-resistant, high flow rate, high negative pressure.
Magnetic/Air-Suspension Centrifugal Fans: High-efficiency, energy-saving alternatives to conventional models.
2. Core Selection Parameters
Flow Rate:
– Blast furnace air supply: 65–1050×10³ Nm³/h
– Sintering main exhaust: 500,000–1,000,000 m³/h
– Converter dust removal: 100,000–300,000 m³/h
Pressure: Blast furnace air supply 0.3–0.8 MPa; sintering main exhaust **–8000~–15000 Pa**; converter dust removal 3000–8000 Pa.
Temperature: **Blast furnace/converter flue gas ≤1000℃; dry quenching ≤600℃; gas ≤500℃**.
Materials: Inconel and heat-resistant steel for high temperatures; overlay welding wear layers and ceramic tiles for abrasion resistance; stainless steel and anti-corrosion coatings for corrosion resistance.
III. Selection and Application Summary
The core of steel centrifugal fans lies in matching process requirements for pressure, flow rate, temperature, and dust/corrosion exposure. Prioritize high-efficiency energy-saving models (magnetic levitation/air suspension), wear-resistant, high-temperature-resistant, and explosion-proof designs.