以铜藻发酵沼渣为原料，利用热重仪进行热重分析，并于350~550℃范围内进行热解实验，研究了沼渣在不同温度下的热解特性。利用GC、GC-MS等手段对裂解制得的生物油和裂解气进行组成成分分析。结果表明，沼渣失重分为脱水、蛋白质和纤维素分解、木质素热解及焦油二次裂解4个阶段。随着反应温度的升高，生物油产率先增后减，在450℃达到最大31.05%；同时，生物炭产率逐渐降低，裂解气产率逐渐增加。随着温度升高，生物油中酚类化合物质量分数显著增加，最高达到47.5%。因含氮和氧量较高，所得生物油并不适宜直接作为燃料油使用，但其中所含的酚类化合物和含氮化合物具有较高的应用价值。

The digestates from anaerobic fermentation of sargassum horueri are used as raw materials to carry out pyrolysis experiments at temperatures from 350 to 550℃ while the pyrolysis characteristics of digestates under different temperatures are investigated by using thermal-gravity analysis.The compositions of pyrolysis gases and bio-oil made from pyrolysis are analyzed by means of GC and GC-MS methods.It is shown that the pyrolysis of sargassum horueri-based digestate consists of four stages including dehydration, decomposition of cellulose and proteins, pyrolysis of lignin and secondary cracking of tar.With the increase of temperature, the bio-oil yield increases at first and then decreases after reaching a maximum about 31% at 450℃, on the other hand, the char yield decreases gradually and the cracking gas yield increases monotonously.With the increase of temperature, the content of phenolic compounds in bio-oil product increases, up to 47.5%.It is noted that the bio-oil obtained from the pyrolysis of sargassum horueri-based digestate is not suitable for direct use as fuel because of its high contents of nitrogen and oxygen.However, it can be a good resource for some value-added compounds, such as phenolics, pyridine, pyrazine etc.

韦一(1989-),男,博士,讲师,研究方向为生物质能源转化,philwei@zjut.edu.cn。