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PROCESS
Rotary Borings Dryers
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  • Chips from machining operations are fed into the input hopper

  • Screw feeder feeds the chips into the rotary retort

  • Exhaust gases, smoke and dust particles are collected in the smoke hood and then discharged to the air quality control system. A burner in the smoke hood prevents oil vapor from condensing in the duct to the air quality control system

  • Chips are heated to 800 to 900°F inside the rotary retort evaporating the water and oil on the chips

  • Gas-fired burners heat the retort from the outside. This indirect heat prevents flame impingement on the chips that could cause surface oxidation

  • Dried chips exit the rotary retort and enter the rotary cooling section where the chips are cooled to approximately 300 to 400°F using room air

Rotary Borings Dryers

EnviroAir Rotary Borings Dryers are used to dry and de-oil wet, contaminated chips from machining operations for improved safety in remelting operations and to reduce contamination in the recycled material. EnviroAir offers nine standard models ranging from 5 to 300 cubic feet of chips per hour.

Advantages of EnviroAir Rotary Borings Dryers:

  • Indirectly heated – no flame impingement on chips that could cause surface oxidation
  • Fully automatic system – simple to operate
  • Robust, simple design – low maintenance

Download Case Study (PDF)

Air Quality Control System

EnviroAir will furnish a complete air pollution control system for your rotary borings dryer that will meet EPA and local air quality control standards.

A typical pollution control system includes:

  • Cyclone for removing large particulate
  • Thermal oxidizer for destroying oil vapor and smoke
  • Heat recuperator (shell and tube heat exchanger) for preheating the exhaust gases entering the thermal oxidizer to reduce fuel costs
  • Baghouse for removing fine particulate

Auxiliary Equipment

EnviroAir will design and furnish a complete chip processing system to meet your chip drying requirements.

Typical dryer infeed equipment may include:

  • Infeed chip hopper
  • Chip wringer to provide uniform moisture content
  • Chip storage silo
  • Screw conveyors, bucket elevators and belt conveyors

Typical equipment at the dryer discharge includes:

  • Bucket elevator for lifting and cooling the chips
  • Vibratory pan feeder to distribute chip
  • Double drum magnetic separator
  • Vibratory screen separator to remove fines

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