Nonisothermal Thermogravimetric Analysis of Thai Lignite with High CaO Content

Table 2

Calculated combustion kinetic parameters.

Method	Material		𝑛	Average	s.d.
FWO	Low CaO lignite	𝐸 (kJ/mol)		58.40	6.35
		𝐴	1st	1.30×10^−4	1.04×10^−4
			2nd	2.13×10^−4	1.64×10^−4
			3rd	3.98×10^−4	3.08×10^−4
	High CaO lignite	𝐸 (kJ/mol)		88.55	46.87
		𝐴	1st	1.58×10^−5	1.37×10^−5
			2nd	2.03×10^−5	1.72×10^−5
			3rd	4.72×10^−5	3.86×10^−5
KAS	Low CaO lignite	𝐸 (kJ/mol)		47.25	6.30
		𝐴	1st	1.70×10^−2	1.03×10^−2
			2nd	2.84×10^−2	1.78×10^−2
			3rd	5.51×10^−2	4.18×10^−2
	High CaO lignite	𝐸 (kJ/mol)		74.35	42.21
		𝐴	1st	1.88×10^−2	2.85×10^−2
			2nd	4.14×10^−2	7.04×10^−2
			3rd	1.10×10^−1	2.11×10^−1