Process for treating oily sludge through hot steam

Abstract

The invention relates to a process for treating oily sludge through hot steam. The process comprises the following steps that an oily sludge stock solution is pumped into a pre-treatment system through a pipeline, and the dehydration rate of sludge reaches 93% to 98% under the process conditions that the sound intensity ranges from 0.5 W / cm<2> to 0.8 W / cm<2>, the frequency ranges from 5 kHz to 25 kHz, the action time ranges from 3 min to 8 min, the demulsifier dosage ranges from 0.2% to 0.7%, the temperature ranges from 60 DEG C to 80 DEG C, and sedimentation is conducted for 1 h to 2 h; then the oily sludge stock solution is sent into a smashing unit, and large particles are ground into microparticles; the pretreated dehydrated sludge is conveyed to a heat treatment system through a closed conveyor belt, the pretreated dehydrated sludge meets with a hot steam jet flow vertically in a treatment trough of the heat treatment system, the oily sludge is directly decomposed into individual components, and organic matter such as heavy oil and asphaltene in the oily sludge is subjected to pyrolysis under the action of a mesoporous pyrolysis catalyst. According to the process, water of oily sludge is efficiently removed, the treatment intensity of the subsequent process is reduced, most of crude oil in the oily sludge can be recycled, the organic matter such as the heavy oil and the asphaltene can be subjected to pyrolysis due to high temperature heating, and the efficiency and quality of recycled oil can be improved.

Description

technical field [0001] The invention relates to a process for treating oily sludge with hot steam. Background technique [0002] Oily sludge is an oily solid waste produced during oil extraction, well workover operations, transportation, refining, tank cleaning, and oily sewage treatment. Oily sludge is a mixture of various forms formed by mixing crude oil or refined oil with soil or other media. Generally, the oil content is 10% to 20%, the water content is 40% to 90%, and it also contains heavy metals and other substances. If it is directly discharged, it will occupy a large amount of land, and the toxic substances it contains will pollute the water, soil and air, and deteriorate the ecological environment; if it is directly used for reinjection and circulation in the sewage treatment system, it will cause the quality of the injected water to decline and the sewage treatment system Deterioration of operating conditions will cause unpredictable losses to production. Oily ...

AI Technical Summary

Problems solved by technology

[0004] At present, domestic industrial applications include: rotary furnace pyrolysis method, solidification incineration method, steam injection, ultrasonic radiation reaction method, three-phase separation method, supergravity solid-liquid separation method, microbial degradation method, oily sludge profile control technology, etc. There are many kinds of treatment processes, each with its own strengths, but all of them have certain adaptability and limitations, or the process is complicated, management is difficult, or the construction investment and operation cost are too high, or the treatment capacity is limited, or the treatment period is long. Or the recovery of processed products, the utilization rate is not ideal, etc., it is difficult to truly realize the application of large-scale or industrialization