[Components of oil sludge and their influence on pyrolysis behaviors]

Based on property analysis of oil sludge and its main components (mineral oil and minerals), pyrolysis process and releasing behavior of non-condensed gas of oil sludge and its main components were studied by thermogravimetric analysis-fourier transform infrared spectroscopy (TG-FTIR) and tubular resistance furnace, respectively. The results indicated that, (1) Oil sludge was characterized as relatively high heating value (15 422.41 kJ/kg), higher mineral content (61.57%) mainly composed of quartz. Mineral oil component had good thermal conversion property and adhered close with mineral in oil sludge. (2) Pyrolysis process of oil sludge included 5 stages: water volatilization and gas desorption (50-180 degrees C), light oil volatilization (180-370 degrees C), heavy oil pyrolysis (370-500 degrees C), semi-coke charring (500-600 degrees C) and mineral decomposition (higher than 600 degrees C). (3) Minerals influenced oil pyrolysis by surface function and enhancing heating conductivity, meanwhile minor elements in mineral oil could bring mineral decomposition temperature down. (4) Minerals affected the releasing behavior of non-condensed gas from mineral oil pyrolysis and resulted in lower total production and higher H2 production.