Heavy components affect conversion behaviors of sludge-derived pyrolytic liquids during their utilization and contribute significantly to the formation of the notorious tar and soot during sludge gasification and combustion. Understanding the evolution of heavy components during pyrolysis is vital for developing a reliable sewage sludge utilization technology. This study investigates the compositions of oils from the pyrolysis of sewage sludge using an electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT ICR-MS). Hundreds of compounds with molecular mass higher than 400 Da were detected from the pyrolytic oil obtained at 450 and 650 °C. Higher pyrolysis temperatures promoted decomposition and polycondensation of large molecules and increased the amount of nitrogen-containing compounds in the liquid. Aromatic structured molecules consisting of carbon, hydrogen and nitrogen were the predominant compounds at 850 °C. From the results of this study, the evolution routes of heavy components in the pyrolytic liquid are proposed.

重组分会影响污泥衍生的热解液体在其使用过程中的转化行为，并在污泥气化和燃烧过程中显着地导致臭名昭著的焦油和烟灰的形成。了解热解过程中重组分的演变对于开发可靠的污水污泥利用技术至关重要。这项研究使用电喷雾电离傅立叶变换离子回旋共振质谱（ESI FT ICR-MS）研究了污水污泥热解过程中产生的油的成分。从在450和650°C下获得的热解油中检测到数百种分子量高于400 Da的化合物。较高的热解温度促进大分子的分解和缩聚，并增加液体中含氮化合物的量。在850°C下，由碳，氢和氮组成的芳香结构分子是主要化合物。根据研究结果，提出了热解液中重组分的演化途径。