Preheating

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

  • The Basics
  • Design and Options

Key Benefits

  • Effective emission control
  • Easy operation
  • Highly reliable
  • Optimised fuel and power consumption
  • Long refractory life
  • Excellent suitability to low-grade fuels

 

Operating Characteristics

  • Lowest NOx emission from unique high-temperature reduction zone
  • Simultaneous low CO emission due to mid-calciner notch and specially designed exit duct
  • Inherently simple operation with single points of entry of calciner fuel and tertiary air. Suitable for firing both traditional and alternative fuels
  • Special option with a high-temperature oxidation zone makes the low-NOx ILC even better for burning petcoke and other alternative fuels by simultaneously ensuring more rapid burnout and further improved NOx control

 

 

 

 

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.

 

Learn more!

Read more about FLSmidth's preheater systems.
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ILC Preheater System

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 12000 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%

Meeting future demands

Modern pyro-process solutions require an optimal preheater layout that is flexible enough to meet future demands – such as stricter emission legislation or the desire to burn more or different types of alternative fuels.

If not already included from the beginning, provisions may be made for future installation of a HOTDISC reactor, downdraft calciner, high-temperature oxidation zone or extended calciner residence time.

 

Creating an SLC-D

By adding a calcining chamber to the ILC, it’s possible to quickly give the ILC the flexibility and efficiency of the SLC-D Separate Line Calciner - Downdraft.

  • Sales

    Gregers Schmidt
    Cement Plant Projects & Machines
    Tel: +45 36 18 36 53
    Fax: +45 36 30 18 20
    gs@flsmidth.com
  • Upgrades

    Steen H. Iversen
    Cement Plant Upgrades
    Tel: +45 36 18 24 67
    Fax: +45 36 30 18 20
    shi@flsmidth.com
  • Services & Spare Parts

    Freddy Pedersen
    Spare Parts & Services
    Tel: + 45 36 18 26 28
    Fax: +45 36 30 18 20
    fhp@flsmidth.com
  • Main Office

    FLSmidth A/S
    Cement Technologies & Corporate Matters
    Vigerslev Allé 77
    2500 Valby
    DENMARK
    Tel: +45 36 18 10 00
    Fax: +45 36 44 11 46
    info@flsmidth.com

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