MECHANISM OF LOW TEMPERATURE PYROLYSIS OF OILY SLUDGE A CASE STUDY OF DAQING OILFIELD CHINA

Different thickness of oily sludge has different effect on the quality of pyrolysis residue. In order to improve the treatment effect of oily sludge in oilfield, the mechanism of low temperature pyrolysis of oily sludge was investigated, and Daqing Oilfield of China was taken as example. The whole pyrolysis reaction of oil sludge with different physical quality was carried out intermittently at atmospheric pressure. The treatment process is divided into temperature control system, pyrolysis reaction system, product condensation system, tail gas metering and treatment system to obtain the value of pyrolysis residue mineral oil. The optimum pyrolysis temperature was determined to be 500 degrees C, pyrolysis time was 30 min, and the output quality was obviously better than the quality of recovered oil, so as to complete the study of low temperature pyrolysis mechanism of oily sludge. The experimental results show that the higher the pyrolysis temperature, the stronger the heat cracking reaction. When the temperature is higher than 550 degrees C, the pyrolysis oil production begins to decrease. The higher the pyrolysis time, the lower the value of mineral oil, when it is in about 50 min, it gradually stabilizes. Different thickness of oily sludge has certain effect on the quality of solid residue after pyrolysis, and the pressure affects the gas injection effect in Daqing Oilfield.