Kinetic study of MSW incineration fly ash melting by DSC-DTA

In this work, the melting process of MSWI (municipal solid waste incineration) fly ash was studied by high-temperature DSC-DTA experiments performed under the temperature range of 20-145^DDGC and some other parameter variables including atmosphere (O₂ and N₂), heating rates (5°C/min, lO°C/min, 20°C/min) and CaO addition. Two samples of MSWI fly ash used in the experiment were collected from a power station in southern China and the Rouen power station in France respectively. Three main transitions were observed during the melting process of fly ash: dehydration, polymorphic transition and fusion, which occur in the temperature range of 100-200°C, 480-670°C and 1101-1244°C, respectively. Finally, a zero-order kinetic model of fly ash melting reaction was established and the apparent activation energy of MSWI ash melting was obtained.