含油污泥的热解特性研究

利用热重 傅里叶变换红外光谱联用仪与管式电阻炉对含油污泥热解特性进行了研究，分析了热解过程及影响因素（污泥性质与升温速率），并由气体析出特性研究了热解机理。结果表明，热解过程包括水分挥发、轻质油挥发、重质油热解、半焦炭化与矿物质分解五种反应，矿物油反应集中发生在220℃～480℃。污泥性质影响因素中，产生环节最为显著，罐底泥、污水污泥失重明显而落地油泥失重不明显，矿物质组分含量越高，挥发分转化率越低；而污泥的油源基属影响较小。升温速率越大，反应进行的越快，挥发分转化率降低。热解机理包括矿物油含氧官能团裂解，链烃及侧链上的断链，环化、芳构化以及缩合脱氢。

Pyrolysis properties of oil sludge

Pyrolysis characteristics of oil sludge were studied by thermogravimetric analysis-Fourier transform infrared spectroscopy (TG-FTIR) and tubular electric furnace. The pyrolysis process and major influence factors like sludge property and heating rate were analyzed. The releasing behavior of non condensed gas was also studied to understand pyrolysis mechanism. The results indicate that the pyrolysis process has five reactions including water volatilization, light oil volatilization, heavy oil pyrolysis, semi coke charring and mineral decomposition. Reaction of mineral oil focuses on 220℃～480℃. The source of sludge is important for its pyrolysis behavior. The weight loss of bottom sludge and sewage sludge is greater than that of petroleum contaminated soil. Property of oil source is less important relatively. mineral content was higher, volatile conversation rate increased; With the rising of heating rate the reaction rate increases, while volatiles conversion rate decreases. Pyrolysis mechanism includes cracking reaction of oxygenous functional groups, chain scission of linear and side chains of hydrocarbon, cyclization, aromatization and condensation reactions to dehydrogenate.