液相循环对制糖固废共水热碳化影响机制研究  

Study on the mechanism of liquid-phase cycling on the co-hydrothermal carbonation of sugar solid waste

作　　者：陈思思 薛宇阳 唐兴颖 王智洁 张莹莹 钱黎黎 李尚泽 王英辉 CHEN Si-si;XUE Yu-yang;TANG Xing-ying;WANG Zhi-jie;ZHANG Ying-ying;QIAN Li-li;LI Shang-ze;WANG Ying-hui(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;Guangxi Laboratory on the Study of Coral Reefs in the South China Sea/Coral Reef Research Center of China,School of Marine Sciences,Guangxi University,Nanning 530004,China;School of Energy and Power Engineering,Jiangsu University,Zhenjiang 212000,China;Guangxi Institute of Green and Low Carbon Technology Co,Ltd,Nanning 530022,China)

机构地区：[1]广西大学资源环境与材料学院,广西南宁530004 [2]广西大学海洋学院,广西南海珊瑚礁研究重点实验室/珊瑚礁研究中心,广西南宁530004 [3]江苏大学能源与动力工程学院,江苏镇江212000 [4]广西产研院绿色低碳技术研究所有限公司,广西南宁530022

出　　处：《中国环境科学》2025年第3期1364-1374,共11页China Environmental Science

基　　金：国家自然科学基金资助项目(22068003);广西科技重大专项项目(AA22117014)。

摘　　要：本研究以糖厂滤泥和甘蔗渣为原料,在240℃-60min-质量比5:1条件下共水热碳化,研究液相循环对共水热碳化固液相产物影响,并探究其反应路径.结果表明,液相循环促进了共水热碳化的反应进程,水热炭性质明显改善.随着液相循环进行,水热炭产率和高热值(HHV)大幅提高,灰分含量显著降低,其表面微球结构数量增多,第二次循环后水热炭获得最大比表面积31.2m^(2)/g,基团CH_(X),C-C/C=C和-C-OR/-C-NR含量呈上升趋势,而C=O/C=N和-COOR含量明显减少;液相产物中有机酸和酮类含量增多,芳香族化合物从0.31%增加到13.75%,碳氢化合物、酰胺类和酯类减少.液相循环下,有机酸积累形成的酸性环境催化了水解等反应的发生,并促进美拉德反应的进行,有效提高水热炭的芳构化程度,有利于强化水热炭表面的含氧官能团,使其提供更多的化学位点,赋予了水热炭更优异的吸附性能,提高其土地利用潜力.The study utilized filter mud and bagasse as raw materials for the co-hydrothermal carbonization process at240℃-60min-5:1.The primary objective of this study was to investigate the impact of liquid-phase cycling on the solid-liquid phase products of the co-hydrothermal carbonization process and to elucidate the reaction pathways.The experimental findings demonstrated that liquid-phase cycling significantly enhanced the reaction process of co-hydrothermal carbonization,resulting in substantial improvements in the hydrochar properties.In the liquid-phase cycling process,there was a substantial increase in the hydrochar yield and higher heating value(HHV),accompanied by a significant decrease in ash content and an increase in microsphere structures on the surface.Following the second cycling,the hydrochar obtained a maximum specific surface area of31.2m^(2)/g,and the contents of the groups CHX,C-C/C=C,and-C/OR/-C-NR exhibited a tendency to increase,while the contents of C=O/C=N and-COOR decreased significantly;In the liquid-phase products,the contents of organic acids and ketones increased.Concurrently,the proportion of aromatic compounds remarkably rose from 0.31%to 13.75%,and hydrocarbons,amides,and esters decreased.Within the liquid-phase cycle,the acidic environment generated by the accumulation of organic acids served as a catalyst for hydrolysis and other reactions,and simultaneously facilitated the Maillard reaction,which effectively enhanced the degree of aromatization of the hydrochar.Moreover,it was beneficial for fortifying the oxygen-containing functional groups on the surface of the hydrothermal carbon,thereby creating more chemically active sites.Consequently,the hydrochar was bestowed with enhanced adsorption capabilities and its potential for land application was elevated.

关 键 词：液相循环 共水热碳化 水热炭 糖厂滤泥 甘蔗渣 

分 类 号：X705[环境科学与工程—环境工程]