Thermogravimetric kinetic analysis of Nannochloropsis oculata combustion in air atmosphere

• Published in: Frontiers in Energy 2015-06, Vol.9 (2), p.125-133
• Main Authors: Sukarni, Sudjito, Hamidi, Nurkholis, Yanuhar, Uun, Wardana, I. N. G.
• Format: Article
• Language: English
• Subjects: air atmosphere; Algae; Alternative energy sources; Atmosphere; Biomass; Biomass energy; Carbon dioxide; Combustion; Decomposition; Emissions; Energy; Energy Systems; Environmental impact; Experiments; Fossil fuels; Global warming; Greenhouse effect; Heating; High temperature; kinetic parameters; Kinetics; Lipids; Mechanical engineering; Methods; Nannochloropsis oculata; Research Article; Studies; Temperature; Thermal decomposition; thermogravimetric; 动力学分析; 升温速率; 微绿球藻; 温度范围; 热分解过程; 热重; 燃烧; 空气气氛
• ISSN: 2095-1701; 2095-1698
• DOI: 10.1007/s11708-015-0346-x

The thermal behavior of Nannochloropsis oculata combustion in air atmosphere were investigated by performing experiments on STA PT1600 Thermal Analyzer at heating rates of 10℃/min, 40℃/min and 70℃/min and range of temperatures from room tempera- ture to 1200℃. The kinetic parameters were evaluated by using Kissinger and Ozawa methods. The result showed that Nannochloropsis oculata combustion occurred in five stages. Started with initial devolatilization, the main thermal decomposition and combustion process, transition stage, the combustion of char and the last stage was the slow burning reaction of residual char. In line with increasing heating rate, the mass loss rate increased as well, but it delayed the thermal decomposition processes toward higher temperatures. The average activation energy at the main thermal decomposition stage and the stage of char combustion were approximately 251 kJ/mol and 178 kJ/mol, respectively.