Nzediegwu Christopher, Naeth M Anne, Chang Scott X
Department of Renewable Resources, University of Alberta, Edmonton, Alberta T6G2E3, Canada.
Department of Renewable Resources, University of Alberta, Edmonton, Alberta T6G2E3, Canada.
Bioresour Technol. 2021 Jun;330:124976. doi: 10.1016/j.biortech.2021.124976. Epub 2021 Mar 13.
The hydrothermal carbonization (HTC) process that converts wet/dry biomass to hydrochars (for use as solid fuels or adsorbents) needs to be optimized. We investigated the interactive effects of feedstock type and HTC temperature on chemical, fuel, and surface properties of hydrochars produced from lignocellulosic (canola straw, sawdust and wheat straw) and non-lignocellulosic feedstocks (manure pellet) at 180, 240 and 300 °C. Increased HTC temperature decreased hydrochar yield and surface functional group abundance, but increased hydrochar thermal stability due to increased devolatilization and carbonization. Hydrochar surface area ranged from 1.76 to 30.59 mg, much lower than those of commercially available activated carbon. Lignocellulosic and non-lignocellulosic feedstocks were distinctly affected by HTC temperature due to variable carbonization from ashing. Hydrochars produced from lignocellulosic biomass at 240 and 300 °C resembled high-volatile bituminous coal. Hydrochars should be designed for specific applications such as fuels by selecting specific feedstock types and carbonization conditions.
将湿/干生物质转化为水热炭（用作固体燃料或吸附剂）的水热碳化（HTC）过程需要进行优化。我们研究了原料类型和HTC温度对在180、240和300°C下由木质纤维素原料（油菜秸秆、锯末和小麦秸秆）和非木质纤维素原料（粪粒）生产的水热炭的化学、燃料和表面性质的交互作用。HTC温度升高会降低水热炭产率和表面官能团丰度，但由于挥发分和碳化作用增加，会提高水热炭的热稳定性。水热炭表面积在1.76至30.59毫克之间，远低于市售活性炭。由于灰化导致的碳化程度不同，木质纤维素和非木质纤维素原料受HTC温度的影响明显不同。在240和300°C下由木质纤维素生物质生产的水热炭类似于高挥发分烟煤。应通过选择特定的原料类型和碳化条件，针对特定应用（如燃料）来设计水热炭。
