摘要
利用高温DSC DTA热分析仪对国内外 2种城市垃圾焚烧飞灰在惰性气氛 (N2 )和氧化气氛 (O2 )下的熔融特性进行了研究 .在 2 0℃～ 1 45 0℃的温度范围内采用 3种温升速率进行实验 .飞灰熔融过程包含多晶转变和熔融相变 2种反应 ,多晶转变发生在 480℃～ 670℃范围内 ,吸热量 2 0kJ/kg ;熔融约发生在 1 1 3 6℃～ 1 2 3 1℃ ,在1 1 74℃达到峰值 ,熔融相变潜热约 70 0kJ/kg ,整个过程总吸热量约 1 80 0kJ/kg .研究了CaO添加剂对飞灰熔融的影响 .最后提出飞灰熔融吸热量的预测模型 。
Melting characteristics of two kinds of municipal solid waste incineration(MSWI) fly ash were studied in this paper by high temperature differential scanning calorimetry and differential temperature analysis. MSWI fly ash was considered as hazardous waste because it contains heavy metals and dioxins. The experiments were performed in either N 2 or O 2 atmosphere in temperature range of 20℃～1450℃ at various heating rates. Two different MSW incineration fly ashes used in the experiments were collected from our country and France respectively. The process of fly ash melting exhibits two reactions occurring at temperature ranges of about 480℃～670℃ and 1136℃～1231℃, respectively. The latent heat of polymorphic transformation and fusion were approximately 20kJ/kg and 700kJ/kg, while the total heat required for melting process was about 1800kJ/kg. The paper also studied effect of CaO to melting. A heat flux thermodynamic model for fly ash melting was put forward and it agrees well with experimental data.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2002年第4期113-117,共5页
Environmental Science
基金
国家自然科学基金重点项目 (5 9836 2 10 )
国家自然科学基金项目 (5 0 0 76 0 37)
浙江省自然科学基金青年科技人才培养专项基金项目 (RC990 4 1)
