两种木质纤维水解渣的热解特性分析

对木粉酸水解残渣(WAHR)和木糖渣(XR)两种木质纤维水解残渣进行了基本物性分析,采用热重分析仪和自制的管式高温裂解炉探讨了这两种水解残渣及其母料的热解特性.结果表明:两种水解残渣较其母料有更高的碳含量,且WAHR的碳含量比XR高;两种水解残渣的组成和热解特性存在较大差异;XR的气相产物和液相产物产率在整个研究温度区间均高于WAHR,并且H2、CO、CO2、CH4、C2H4和C2H6的产率随温度变化的规律不同;两种水解残渣的液相产物种类相似,但相对含量存在差别;半焦样品的CO2气化反应活性随温度的升高而降低;原料的木质素含量越高,所得半焦样品的反应活性越低.

Analysis of Pyrolysis Properties of Hydrolysis Residues of Two Kinds of Lignocelluloses

In this paper,the primary physical properties of the hydrolysis residues of two kinds of lignocelluloses,namely the acid hydrolysis residue of wood powder(WAHR) and the xylose residue(XR),were analyzed,and the pyrolysis characteristics of the residues and their parent materials were investigated by using a thermogravimetric analyzer and a self-developed tube furnace reactor.The results show that the residues both possess higher carbon content than their parent materials,that WAHR possesses higher carbon content than XR,that there exist great differences in the composition and pyrolysis properties of the two residues,that the yields of gaseous and liquid products of XR are higher than those of WAHR in the whole investigated temperature range,that the yields of H2,CO,CO2,CH4,C2H4 and C2H6 vary with the temperature in different rules,that the liquid products of the two residues are similar in species but different in content,that the CO2 gasification reactivity of chars derived from both WAHR and XR decreases with the increase in pyrolysis temperature,and that higher content of lignin in parent materials may leads to lower reactivity of chars.