COMBUSTION MODELING OF A ROTARY-KILN HAZARDOUS WASTE INCINERATOR

摘要

Hazardous waste has very complicated chemical compositions in a variety of physical forms and isdifficult to characterize. Due to the complex transport phenomena within the incinerator the incinerationprocess expects large uncertainties in the process chemistry and thermal/ emission control. For betterunderstanding of the incineration process, process simulation was conducted using Computational Fluiddynamics(CFD) to characterize temperature and species distribution in the incinerator. Hazardous wastein various forms is firstly converted to a hydrocarbon-based virtual fuel mixture. The combustion of thesimplified waste was then simulated with a global 3-gas and an extended 7-gas combustion model. Thedistribution of temperature and chemical species is broadly investigated. The predicted temperaturedistribution has been validated with available measurement data from the operating rotary kiln wasteincinerator AVR-Chemie in the Netherlands. New statistical post-processing of the standard CFD-outputhas been developed to give an overview of the average temperature profile and overall reactor behavior asvaluable contribution to process control. Finally, an attempt has been made to simulate the multi-phaseflow of the shredded solid waste within the incinerator in order to optimize the burner design.