Investigation of MSWI fly ash melting characteristic by DSC-DTA.
The melting process of MSWI (Municipal Solid Waste Incineration) fly ash has been studied by high-temperature DSC-DTA experiments. The experiments were performed at a temperature range of 20-1450 degrees C, and the considerable variables included atmosphere (O(2) and N(2)), heating rates (5 degrees C/min, 10 degrees C/min, 20 degrees C/min) and CaO addition. Three main transitions were observed during the melting process of fly ash: dehydration, polymorphic transition and fusion, occurring in the temperature range of 100-200 degrees C, 480-670 degrees C and 1101-1244 degrees C, respectively. The apparent heat capacity and heat requirement for melting of MSWI fly ash were obtained by DSC (Differential Scanning Calorimeter). A thermodynamic modeling to predict the heat requirements for melting process has been presented, and it agrees well with the experimental data. Finally, a zero-order kinetic model of fly ash melting transition was established. The apparent activation energy of MSWI fly ash melting transition was obtained.
Li
Rundong
R
Institute of Clean Energy and Environmental Engineering, Liaoning Key Laboratory of Clean Energy, Shenyang Institute of Aeronautical Engineering, Shenyang 110136, China. leerd@mail.tsinghua.edu.cn
Wang
Lei
L
Yang
Tianhua
T
Raninger
Bernhard
B
D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry; D002152:Calorimetry, Differential Scanning; D002244:Carbon / Q000032:analysis* / Q000737:chemistry; D002947:Cities; D060729:Coal Ash; D017745:Incineration / Q000379:methods*; D007220:Industrial Waste; D007700:Kinetics; D008954:Models, Biological; D009584:Nitrogen / Q000032:analysis / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D010100:Oxygen / Q000032:analysis / Q000737:chemistry; D052638:Particulate Matter / Q000032:analysis* / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods*; D013696:Temperature
D000393:Air Pollutants; D017610:Calcium Compounds; D060729:Coal Ash; D007220:Industrial Waste; D010087:Oxides; D052638:Particulate Matter; D002244:Carbon; C016538:lime; D009584:Nitrogen; D010100:Oxygen