In a recent publication, Chen et al. (2011) studied the thermogravimetric behavior of the combustion of the microalgae Chlorella vulgaris and described a kinetic analysis based on Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) methods in the work entitled: 鈥淭hermogravimetric analysis of microalgae combustion under different oxygen supply concentrations鈥?(Appl. Energy 88 (2011) 3189-3196). Some comments about this work are discussed in the present letter to the editor.