Nonisothermal thermogravimetric analysis of Thai lignite with high CAO content

• Main Authors: Pakamon Pintana, Nakorn Tippayawong
• Format: Journal
• Published: 2018
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84887417182&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/48203
• Institution: Chiang Mai University

Thermal behaviors and combustion kinetics of Thai lignite with different SO 3 -free CaO contents were investigated. Nonisothermal thermogravimetric method was carried out under oxygen environment at heating rates of 10, 30, and 50°C min -1 from ambient up to 1300°C. Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) methods were adopted to estimate the apparent activation energy (E) for the thermal decomposition of these coals. Different thermal degradation behaviors were observed in lignites with low (14%) and high (42%) CaO content. Activation energy of the lignite combustion was found to vary with the conversion fraction. In comparison with the KAS method, higher E values were obtained by the FWO method for all conversions considered. High CaO lignite was observed to have higher activation energy than the low CaO coal. © 2013 Pakamon Pintana and Nakorn Tippayawong.