I. Sewage Treatment Industry (Mainstream Scenario)Multi-stage centrifugal fan
Aeration for biochemical tanks to supply oxygen
For small and medium-sized municipal sewage and industrial wastewater (such as dyeing, papermaking, and chemical wastewater), the activated sludge process uses aeration to increase the dissolved oxygen content in the water body. High-pressure and large-flow ventilation is used to enhance the oxygen level. The flow range is 100–400 m³/min. The energy-saving effect of variable frequency is superior to that of Roots blowers.
Sludge drying and gas pressurization transportation
Anaerobic fermentation of biogas purification and pressurization, sludge sweeping and drying; it can be used as an anti-corrosion type for transporting methane and carbon dioxide mixed biogas.
Multi-stage centrifugal fan body
II. Metallurgical and Steel Industry Multi-stage centrifugal fan
Blast for blast furnaces, iron-making furnaces, and vertical furnaces
For high-pressure air supply to smelting furnaces to enhance combustion and raise furnace temperature, increasing the output of pig iron / molten steel; air supply system for sintering machines.
Air supply for converters and heat treatment furnaces
High-pressure air blowing for forging furnaces, annealing furnaces, and mold shell baking furnaces to atomize fuel oil and gas for enhanced combustion efficiency.
Steel smelting blast furnace conditions
III. Chemicals and Fertilizers Multi-stage centrifugal fan
Gasification, fluidized bed reaction air supply
Air supply for gasifiers, ammonia synthesis gasification sections during pressurized transportation; stable supply pressure for fluidized bed catalytic reactions.
Pneumatic conveying in powder chemical industry
Sealed high-pressure transportation of pure alkali, resin, carbon black, catalyst particles; oil-free clean air source to avoid material contamination.
Pressurized recovery of waste gas and tail gas
Pressurized transportation of acidic tail gas, process waste gas to desulfurization and condensation recovery devices.
Power and heat generation
Primary and secondary air supply for coal / gas-fired boilers, induced draft
Supplement oxygen for boiler combustion, negative pressure for flue gas exhaust in furnace; oxidation aeration in desulfurization towers of power plants, ammonia dilution air supply for denitrification.
High-pressure combustion assistance for waste heat boilers, incinerators
High-pressure air supply for hazardous waste incineration, garbage incineration; ensure complete combustion and reduce dioxins.
Mining and coal
Main ventilation in mines, air injection into tunnels
Replacement of polluted air and gas emission from mines in deep shafts; long-distance tunnel air supply compensates for pipeline pressure drop through multiple stages of boosting.
Air supply for washing coal, jigging machines, flotation machines
Supply of bubble for coal washing; aeration in copper oxide flotation tanks, separation of mineral impurities.
Building materials (cement, glass, ceramics)
Air supply for cement kilns, ball mills, preheaters
Auxiliary combustion for rotary kilns, drying ventilation for raw material ball mills, coal powder pneumatic transportation.
Glass melting kilns, ceramic tunnel kilns
High-pressure auxiliary combustion for melting pools, uniform air distribution for ceramic body firing; protection gas for glass tin tanks, micro-pressure supply for trace pressurization transportation.
General pneumatic conveying (general bulk materials)
High-pressure sealed transportation of grains, feed, plastic particles, fly ash, lime powder; large-distance pipeline pressure drop is significant, multi-stage air pressure matching is suitable for long-distance transportation, oil-free clean air is suitable for food-grade materials.
Food, light industry, agriculture
Drying, cooling, packaging in food processing
Hot air circulation drying for food processing lines; negative pressure for vacuum packaging, pressurization for preservation in tanks.
Ventilation and dehumidification of grain storage, high-pressure circulation ventilation in greenhouses
Drying and dehumidification of grain storage, forced ventilation in large greenhouses.
Other general high-pressure ventilation scenarios
Tunnels, underground defense projects, large factories for forced ventilation and smoke removal
Pressure supply in long tunnels, staged pressure supply for underground space sewage and ventilation.
High-pressure purging, equipment cooling, air source for sprinkler water supply pressurization
Steel billet purging in steel mills, cooling air supply for large motors / compressors, water treatment agent spraying air source.
Selection of conditions is simple and distinguishable
Pressure range: 3kPa – 100kPa, flow rate 5–68000m³/h, multi-stage centrifugal is preferred for medium-high pressure and medium-large flow rates;
Compared with Roots: large flow rate, long-term continuous operation, energy-saving requirements for variable frequency are prioritized for multi-stage centrifugal; small flow rate and high pressure select Roots for more economic.
