Nonisothermal Thermogravimetric Analysis of Thai Lignite with High CaO Content. (23rd October 2013)

• Record Type: Journal Article
• Authors: Pintana, Pakamon; Tippayawong, Nakorn
• Other Names: Ballice L. Academic Editor.; Zhou G. Academic Editor.
• Is Part Of: TheScientificWorldjournal. Volume 2013(2013)
• Publication Date: 2013-10-23
• Subjects: Science -- Periodicals; Technology -- Periodicals; Medicine -- Periodicals; 505
• DOI: 10.1155/2013/216975
• Languages: English
• ISSNs: 2356-6140

Abstract

Abstract : Thermal behaviors and combustion kinetics of Thai lignite with different SO3 -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.