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Fuel flexible rotary kilns for the cement industry

Fuel flexible rotary kilns for the cement industry. CHEC Annual Day, 2010. Anders Rooma Nielsen Supervisors: Kim Dam-Johansen (DTU) Peter Glarborg (DTU) Morten Boberg Larsen (FLSmidth). Agenda. Alternative fuels in the cement industry Opportunities/challenges Project goal Current work.

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Fuel flexible rotary kilns for the cement industry

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  1. Fuel flexible rotary kilns for the cement industry CHEC Annual Day, 2010 Anders Rooma Nielsen Supervisors: Kim Dam-Johansen (DTU) Peter Glarborg (DTU) Morten Boberg Larsen (FLSmidth)

  2. Agenda • Alternative fuels in the cement industry • Opportunities/challenges • Project goal • Current work

  3. A highly energy intensive industry • Global energy consumption ≈ 10 times the total energy consumption of Denmark. • Cement production is responsible for ≈ 5% of the global CO2 emissions. • Fuel costs accounts for 30-40% of the total costs for cement production. • Coal and pet coke are the traditional primary fuels in the cement industry. Great economical and environmental potential of replacing fossil fuels with alternative fuels.

  4. Examples of relevant alternative fuels Solid fuels, e.g. used tires,waste wood, commercial and industrial waste: • Available in large quantities. • Cheap • Acceptable heating value

  5. Attractive to burn coarse alternative fuels in the rotary kiln Shredding costs can be minimised. BUT direct contact between fuel particles and cement raw materials may affect process stability and product quality!!

  6. Overall successcriteria • Develop a scientific based framework for processes occurring during solid fuel conversion in the material inlet of a cement rotary kiln. This framework should be used for: • Precise prediction of the use of different alternative fuels directly in the material kiln inlet. • Predicting effects of unburned alternative fuel fragments, originating from the calciner, in the material kiln inlet. • Kiln system design modifications and new patentable products that will increase alternative fuel flexibility.

  7. Construction of rotarykilninlet simulator • Investigatecombustion of different alternative fuels under conditionssimilar to those in the kilninlet.

  8. Parameter study in rotatingdrum Tyre rubber cylinder: D = 9 mm, L = 25 mm. 6 rpm, 900°C, 100 NL/min, coarsequartz sand.

  9. Future work Continueexperiments in the rotarydrum: Parameter study of selectedfuels Effect of rawmaterialcharacteristics Sulphur release from rawmaterialsduringcombustion of selectedfuels

  10. Tak for opmærksomheden/ Thanks for the Attention !

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