Result

Gateway to the Future Fives Pillard - Rotary Kiln Burner Eduardo Tater Combustion Fives Pillard - A company of Fives Combustion business unit  ROTAFLAM® Burner: • About 500 burners installed Minerals and Energy Sectors excluding cement kilns. • Fives Pillard: 5 offices - France, Germany, Spain, China and India • In more than 50 countries • Key markets: 5 continents • For more than 20 different applications: • Income: 68 Mio € • Headcount: 385 persons  Lime  Uranium  Ferronickel  Phosphates  Lithium  Manganese More than  Magnesia  Nickel / Cobalt In  Alumina  Titanium dioxide  Zinc oxide  Attapulgite 110 countries 1300 burners installed  Gypsum  Iron  Copper  Chromium Kaolin  Chamotte  Pelletizing …. Combustion efficiency Burner operability Combustion 2 Lime Calcination Combustion 3  Peers Conference 2019 – Rotary Kiln Burner Soft burned 900 °C Lime calcination Medium burned Hard burned 1300°C Source: [44, EuLA, 2006], [168, TWG CLM, 2007] CALCINATION RATE & LIME REACTIVITY DEPENDS ON: • Characteristics of the limestone / lime mud • Particle size distribution • Shape of the particles (for limestone calcination) • Burning temperature & Temperature profile • Residence time • Crystalline structure of limestone / lime mud • Presence of impurities creating interstitial liquid phase • Kiln type (pebble lime) and fuel Source: Lhoist University Combustion 4 Peers Conference 2019 – Rotary Kiln Burner Lime calcination Burner impact on the lime calcination:  Controls flame shape and the kiln temperature profile: o One of the main parameters affecting the lime quality (residual carbonate & reactivity).  The flame should have the correct length: o Too short  Excessive temperatures in burning zone, lime surface overburning and reducing reactivity. Risk of refractory failure. o Too long  Insufficient radiant heat transfer in calcining zone, higher back-end temperature and lower thermal efficiency. Risk of rings and build-ups formation due to lazy and unstable flame (temperature variations) Combustion 5 Peers Conference 2019 – Rotary Kiln Burner Lime calcination NOx emissions: a good indicator of burning zone conditions • NOx emissions in rotary kilns: mainly of Quality Quality overshooting (Higher NOx em