Open AccessEffects of process parameters on the physicochemical properties of corn stalk hydrochar and the removal of alkali and alkaline earth metals
Author(s) -
Yang Li,
Wang Hui,
Sun Jianwei,
Xu Yiyun,
Li Pengcheng,
Xu Youning,
Wu Shaohua
Publication year - 2021
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
eISSN - 1752-1424
pISSN - 1752-1416
DOI - 10.1049/rpg2.12082
Subject(s) - hydrothermal carbonization , stalk , biomass (ecology) , chemistry , carbonization , raw material , carbon fibers , alkali metal , yield (engineering) , pulp and paper industry , chemical engineering , materials science , agronomy , organic chemistry , metallurgy , composite material , adsorption , composite number , horticulture , biology , engineering
The advantages of the direct combustion of agricultural biomass for power generation are restricted due to the drawbacks of this biomass and the deep peak shaving trend. Hydrothermal carbonization can improve the physical and thermochemical properties of raw materials. Corn stalk samples were selected as the research object in this study. Corn stalk hydrochars were prepared with reaction pressures of 0–3 MPa, reaction temperatures of 160–240 °C, and residence times of 1–10 h. The effects of the process parameters on the physicochemical properties of hydrochar and on the removal of alkali and alkaline earth metals (AAEMs) were studied by measuring the hydrochar mass, energy yield, product composition, morphology, as well as the removal efficiency of AAEMs. The results indicated that the corn stalk hydrochar had higher mass and energy yields than the raw corn stalk. X‐ray diffraction showed that the carbon content in the hydrochar was greater than that in raw corn stalk. Scanning electron microscopy showed that the reaction temperature played a more significant role in the hydrothermal carbonization process than the reaction pressure and residence time.