In-Line Calciner Preheater System

Delivering industry-leading, simultaneously low NOx and CO emissions, the ILC also offers extremely simple operating efficiency and is the primary standard for pyroprocess systems today

ILC-inline -calciner
  • The Basics
  • Design and Options

Key Benefits

  • Effective emission control
  • Easy operation
  • Highly reliable
  • Optimised fuel and power consumption
  • Excellent suitability to low-grade fuels
  • Flexible design for easy upgrades

Operating Characteristics

  • High-efficiency cyclones with low pressure drop resulting in low fuel and power consumption
  • Lowest NOx emission from unique high-temperature reduction zone
  • Simultaneous low CO emission due to mid-calciner notch and specially designed exit duct
  • Uncomplicated operation with single entry locations of calciner fuel and tertiary air
  • Suitable for firing both traditional and alternative fuels

How it works

In-line calciners generally have lower NOx emissions than separate-line calciners, since all of the kiln exhaust gases must pass through the calciner.

Our low NOx ILC design is based on dividing the meal from the second lowest preheater cyclone to 1) the kiln riser and 2) the calciner, which are separated by an expanded riser duct that forms a NOx reducing zone. That is, the calcining chamber is built (at least partially) into the kiln riser.

This gives a very simple way to create low NOx emissions without the splitting of tertiary air. 100% of the fuel is fired to the kiln riser duct.

Why calciner design is important

Calciner design has a strong influence on operational efficiency, emissions and ability to effectively burn alternative fuels. When considering NOx emissions and CO emissions caused by incomplete fuel combustion, calciner design and operation typically have a much greater impact on emissions than the rotary kiln and kiln burner.

ILC design characteristics

  • Full capacity range of today’s plants, up to 14000 t/d or more
  • Built with single or multiple preheater strings
  • Ratio of firing in calciner: 55-65%
  • Normal bypass of kiln gas: 0-60%
  • Maximum bypass of kiln gas: up to 100% using ILC-I version
  • Calcination at kiln inlet: 92-95%