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The Cement Preheater Tower Reactor

The Cement Preheater Tower Reactor. Martin Hagsted Rasmussen, PhD student Kim Dam-Johansen, Professor Stig Wedel, Associated professor Jytte Boll Illerup, Senior Advisor Hannibal Nielsen, FLSmidth Kim Hougaard Pedersen, FLSmidth The project is a collaboration between:

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The Cement Preheater Tower Reactor

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  1. The Cement Preheater Tower Reactor Martin Hagsted Rasmussen, PhD student Kim Dam-Johansen, Professor Stig Wedel, Associated professor Jytte Boll Illerup, Senior Advisor Hannibal Nielsen, FLSmidth Kim Hougaard Pedersen, FLSmidth The project is a collaboration between: Technical University of Denmark, FLSmidth and Danish National Advanced Technology Foundation

  2. Background, SO2 emission • Raw meal contains about 75 w/w % CaCO3 • Sulfur originates from either fuel or raw meal impurities • Only raw meal impurities are emitted with the exhaust gas • CaCO3 is decomposed to CaO in the calciner • The calciner acts as a SO2 scrubber for fuel SO2

  3. Model Boundaries • Calciner cyclone is not considered • Raw meal feed and gas/solid from calciner must be known • The plant is assumed to be at steady state

  4. Modeling Procedure • Solution procedure • Solution of total mass balance • Solution of energy balance • Solution of cyclone stage reactor model • It is assumed that mass and energy are not formed nor used when solving 1 and 2 • Justified by that less than 1 w/w % of the solid mass reacts

  5. Cyclone Stage Reactor Model • Riser section features • Variable place for solid introduction • Zone for mixing of solid and gas • Variable lengths of zones • Cyclone section features • Instantaneous separation of solid and gas • Different residence time for solid and gas phases • Exchange of gas and solid between zone 1 and 2 • Exchange of gas between zone 2 and 3 • Isothermal

  6. Model Outline

  7. Modeling Results Plant A Plant B Simulations was carried out with plant specific data and a gas mass transfer coefficient of 0.1 between zone 2 and 3

  8. Conclusions • Contact information: • MHR@KT.DTU.DK The proposed model takes known physical phenomena's into account The model predicts plant data very satisfactorily The model needs to be validated against more plant data

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