System of innocent treatment for grease of oil

Abstract

This invention discloses a system for treating petroleum sludge produced during petroleum production and refinery. The system comprises a petroleum sludge pretreating system, a petroleum recovery system, a pyrolysis system, a off-gas treating system, a heat utilization system, and an automatic controlling system. The process comprises: pretreating the petroleum sludge, recovering crude oil, mixing, pyrolyzing, recovering the excess heat, treating the oss-gas, and discharging. The treated petroleum sludge does not contain petroleum or other harmful components, thus is environmentally friendly. The excess heat can be fully utilized, and the residue can be used as a pavement material.

Description

technical field [0001] The invention is a process device system for harmless treatment of oil sludge produced in the process of petroleum production and refining. Background technique [0002] Oil sludge is the mud and sand sediment carried by crude oil in the process of oil extraction and refining, the scum and sediment of oil extraction sewage, and the pollutants formed by the mixing of ground crude oil, soil and sundries produced in the process of drilling and oil extraction. After the oil sludge is discharged into the environment, it will pollute the environment and is listed as hazardous waste in the "National Hazardous Waste List". The oil sludge containing more than 3% of oil must be treated harmlessly. All countries in the world attach great importance to the treatment of oil sludge. What are commonly used at present are separation method, solidification method and biodegradation method. The process flow of the separation method is: oily sludge→stirring liquefactio...

AI Technical Summary

Problems solved by technology

The process flow of the separation method is: oily sludge→stirring liquefaction→heating homogenization→separation. This method can separate and recover a part of crude oil, but it consumes a lot of energy and the treatment is not thorough. The separated mud and sand still contain certain petroleum substances. If it does not meet the burial requirements of environmental protection regulations, further treatment is required; the process flow of the solidification method is: oily sludge → storage tank → adding lime and diatomaceous earth → filter press, filter cake → stacking at the garbage dump. This method is costly and dry. The oil content in the sludge is high and wastes a lot, and if the post-treatment is not timely, it will easily cause secondary pollution; the biodegradation method uses microorganisms to decompose the oily substances contained in the sludge, and has high requirements on environmental factors such as soil properties, temperature, and humidity, and the cycle is long , the investment is large, the scope of application is narrow, and the country is still in the stage of technical exploration