城市垃圾焚烧飞灰熔融动力学研究

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

在高温差示扫描量热差热分析 (DSC- DTA)实验基础上 ,对垃圾焚烧飞灰熔融过程进行研究 ,建立飞灰熔融动力学模型 .在惰性气氛 (N2 )和氧化气氛 (O2 )下 ,2 0～ 14 5 0℃的温度对两种垃圾焚烧飞灰的熔融过程进行研究 ,实验采用了三种温升速率 (5、10、2 0℃ / min) ,并研究了 Ca O添加剂对飞灰熔融的影响 .飞灰熔融过程包含干燥脱水、多晶转变和熔融相变三种反应 ,脱水发生在 10 0～ 2 0 0℃ ,多晶转变发生在 4 80～ 6 70℃ ,熔融发生在 1136～12 31℃ ,在 1174℃达到峰值 .提出了垃圾焚烧飞灰熔融的 0级反应动力学 ,并得到飞灰熔融反应表观活化能 .

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.