TY - JOUR
TI - Effect of hydrothermal carbonization temperature on fuel properties and combustion behavior of high-ash corn and rice straw hydrochar
AU - Sui Zifeng
AU - Wu Jie
AU - Wang Jiawei
AU - Cao Yutong
AU - Wang Qihao
AU - Chen Weipeng
JN - Thermal Science
PY - 2023
VL - 27
IS - 4
SP - 2651
EP - 2664
PT - Article
AB - Hydrothermal carbonization has been proven to improve the fuel properties of low-ash straw biomass. To explore the effect of hydrothermal carbonization on high-ash straw biomass, the fuel properties and combustion behavior of hydrochar prepared by high-ash rice straw and corn straw at different temperature were studied. The results showed that increased reaction temperature could improve the C content, fixed carbon, heating value, and fuel ratios (FC/VM) in high-ash straw hydrochars, which is similar to the change trend of low-ash biomass. The hydrochar prepared at 260°C has similar H/C and O/C atomic ratios and FC/VM to lignite. In addition, the highest energetic recovery efficiency is obtained at 200°C. While at 180°C, the comprehensive combustion characteristic index of the hydrochar is the best, which is 5.04 ⋅ 10–11 [min–2K–3] and 6.42 ⋅ 10–11 [min–2K–3]. In addition, the C content in the hydrochars at 180°C was lower than the raw material, and the ash content increases with the reaction temperature, which is quite different from the low-ash biomass. In conclusion, the hydrothermal carbonization could improve the fuel quality of high-ash straw, while its ash content remains at a high level.