Technologic Process of Oily Sludge Deoiling by Ultrasound

摘要

Oily sludge treatment is a problem in petroleum industry all through, while oily sludge heat cleaning always attracts much attention. In order to improve its efficiency and decrease its cost, the technological route which is ultrasonic irradiation before air floatation is raised. Ultrasonic irradiation modifies the integrative mode of oil and solid particle in oily sludge. Promotion of ultrasound on oily sludge deoiling at different temperatures was researched. The oil content of oily sludge which is deoiled after ultrasound irradiation at 40℃ is 0.055 g/g, and it is about 55.6% less than that without ultrasonic irradiation. Effects of temperature, ultrasonic pressure drop, ultrasonic irradiation time, sludge water ratio and air liquid ratio were investigated. In addition, the experiment conditions were optimized. The optimum condition is as followed: temperature 40℃; ultrasonic pressure drop 0.10MPa; ultrasonic irradiation time 15min; sludge water ratio 1:16; air liquid ratio 0.27(vol.). Finally, water content and solid content of the crude oil after process were measured.