采用热重分析法研究了城市污泥(SS)与小麦秸秆(WS)在220℃下共水热炭化(Co-HTC)产物水热炭(Hydrochar)的燃烧特性与反应动力学。对比分析水热炭从室温升至1 000℃的燃烧特性,采用KAS法计算燃烧过程中样品的活化能。结果表明,水热炭化后,污泥和秸秆的着火温度升高、失重率下降。随着混合物中WS质量分数从30%增加到70%,共炭化产物的综合燃烧特性指数从3.47增加到11.35,燃烧性能显著增强,且T_i和T_f之间的温度区间变窄。城市污泥与秸秆混合水热制备的生物质炭燃烧过程中存在协同作用,在320℃时协同作用最强。WS质量分数为50%时,水热炭燃烧的平均活化能达到最小值,为22.55 kJ/mol。

The combustion characteristics and reaction kinetics of hydrochars,which are produced by co-hydrothermal carbonization of municipal sludge (MS) and wheat straw (WS) at 220℃,are studied by thermogravimetric analysis.The combustion characteristics of hydrochars from room temperature to 1 000℃ are analyzed,and the activation energy of the sample during combustion is calculated by means of KAS method.It is shown that the ignition temperature of both sludge and straw increases,and the weight loss rate decreases after hydrothermal carbonization.Comprehensive combustion characteristic index of co-carbonized products,hydrochars,increases from 3.47 to 11.35 when the mass fraction of WS in the mixtures increases from 30% to 70%,showing a significantly enhanced combustion performance.The temperature range between T_i and T_f becomes narrower.There exists synergistic effect in the combustion process of biomass char prepared by mixing municipal sludge and straw,and the synergistic effect reaches the strongest at 320℃.The average activation energy for combustion of hydrochars reaches the minimum value,22.55 kJ·mol^-1 when the mass fraction of WS is 50%.

胡剑坤(1996),男,硕士研究生,研究方向为固体废弃物的处理与处置,492340282@qq.com