Aluminium smelters

Primary Aluminum smelters utilize large baked carbon anodes in the electrolytic cells (pots) used to smelt the metal.

These anodes are baked in large ovens that emit a hot off-gas laden with HF, SO2, CO2, CO and hydrocarbons from the pitch used to bind the anodes.

This batching process requires precise temperature control of the off gasses, as the fires are moved between oven sections, to protect the fabric filter used and collect the alumina being injected prior to the collector.

These gases must be cooled from 300-450°F (175-200°C) to ~ 210°F (~100°C).

EnviroCare has provided complete spray systems and tower designs for this very sensitive application to smelters worldwide, with commitment,

  • Proven field experience
  • Nozzle design to suit specific application
  • Metallurgy process knowledge
  • Process knowledge

MicroMist Evaporative Gas Conditioning enhances particulate control

Evaporative Gas Conditioning (EGC) is a technique for conditioning flue gas prior to electrostatic precipitators or fabric filters to reduce gas volume, lower the temperature, and improve particulate collection. Finely atomized water is evaporated in the gas stream to lower its temperature and raise the moisture content.

Benefits of MicroMist EGC Electrostatic precipitator (ESP)

  • Reduced gas volume and velocity
  • Increased humidity
  • Increased specific collection area
  • Increased particle migration velocity
  • Lowered gas viscosity
  • Decreased rapping reentrainment

Fabric filter (FF)

  • Reduced gas volume and pressure drop
  • Allows use of lower-priced filter media
  • Decreases air-to-cloth ratio
  • Improves filter cake characteristics

Expertise

  • Over 1000 installations worldwide
  • Water flows up to 440 gpm (100 m3/hr)
  • Complete spray tower design and supply
  • Numerous of nozzle sizes ranging from 0.5 gpm to 60 gpm
  • Pilot equipment available
  • Global representation
  • Large inventory of spare parts
  • Customer Focus
  • Upgrade/retrofit or new installations
  • Broad knowledge of process and dust collector operation
The Evaporative Gas Conditioning systems have also been successfully applied in zinc, nickel and steel smelting processes.