VACUUM PYROLYSIS OF OIL SLUDGE FROM YANCHANG OILFIELD

The paper studied vacuum pyrolysis of oil sludge from Yanchang oilfield and investigated the influence of pyrolysis temperature，time，temperature raising rate，categories and amount of catalysts on oil recovery yield． Powdered fuel was prepared from pyrolysis residue and the heating value was measured． The pollutants in the smoke were analyzed． Results showed that pyrolysis temperature and time had a great effect on oil recovery yield． Activated clay was found to be the best catalyst for pyrolysis and the oil recovery yield achieved 83% when catalyst dosage was 1%． The heating value of the powdered fuel was 24 000 kJ /kg，exceeding that of soft coal． The concentration of pollutants in the smoke were far below the Emission Standard of Air Pollutants for Boiler ( GB 13271—2014) ． Vacuum pyrolysis was an effective resource recovery way for oil sludge．