MECHANISM OF LOW TEMPERATURE PYROLYSIS OFOILY SLUDGE A CASE STUDY OFDAQING OILFIELD CHINA

摘要

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 re- action of oil sludge with different physical quality was carried out intermittently at atmospheric pres- sure. The treatment process is divided into tempera- ture control system, pyrolysis reaction system, prod-uct condensation system, tail gas metering and treat- ment system to obtain the value of pyrolysis residue mineral oil. The optimum pyrolysis temperature wasdetermined to be 500 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 oilysludge. The experimental results show that the higher the pyrolysis temperature, the stronger the heat cracking reaction. When the temperature is higher than 550 C, the pyrolysis oil production be- gins 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.