Fig. 2From: Improvement of corn stover fuel properties via hydrothermal carbonization combined with surfactantThe fuel properties of solid product and CS. a The HHV of solid product, ERE and CRE during HTC. CRE carbon recovery efficiency (%), ERE energetic retention efficiency (%). The calculation formula of energy parameter is shown in Table 5. b Van Krevelen diagram for CS and torrefied solid productBack to article page