Regenerated coal prepared by oil-containing sludge from oil production field and oil-extraction plant and preparation technology thereof

Abstract

The invention relates to an oily sludge renewable coal and a production technology thereof for an oil field and a refinery. The renewable coal composition is composed of 10 percent to 30 percent of oily sludge, 60 percent to 80 percent of coal, 3 percent to 6 percent of sulfur fixing matter and 1 percent to 5 percent of preservative according to the weight percentage. The production technology comprises the following steps: sludge thickening to flocculation reaction to sludge dehydration to stirring and mixing to extrusion forming and drying by a tunnel kiln. The production technology further comprises the disposal technology of wastewater containing oily sludge: wastewater to an oil separating tank to an air flotation tank to an anaerobic tank to an aerobic tank to a secondary sedimentation tank to a transition tank to an electricity charge payment device to a coagulation and air flotation tank to a clean water tank. The wastewater can achieve the national first level discharge standard after the treatment, and the outlet water is reused for green irrigation or car washing or toilet flushing. The oily sludge renewable coal has the advantages of high calorific value, low ignition point and low production cost, thereby truly realizing the purposes of reduction, harmlessness and resource utilization of the oily sludge.

Description

technical field [0001] The invention relates to a technology for treating oily sludge in oil fields and refineries, in particular to regenerated coal from oily sludge in oil fields and refineries and a production process thereof. Background technique [0002] Oily sludge is one of the important pollutants produced during the development, storage and transportation of oil production fields and refineries, and it is also a major problem affecting the quality of oil production fields, refineries and the surrounding environment. Oily sludge is mainly divided into three categories: oily sludge produced by crude oil extraction, oily sludge produced during oilfield gathering and transportation, and oily sludge produced by refinery sewage treatment plants. Oily sludge generally has an oil content of 10% to 50%, and a water content of 40% to 90%. In my country's petroleum and petrochemical industry, an average of 800,000 tons of tank bottom sludge and pool bottom sludge are produced ...

AI Technical Summary

Problems solved by technology

Many methods have some problems, some have high operating costs, large investment in facilities, and generally do not utilize resources

For example, the commonly used domestic incineration method consumes a lot of energy and is prone to secondary pollution, and the oil resources have not been recycled; the biological treatment method takes 41 days to biodegrade 97% of petroleum hydrocarbons, and the oil resources have not been recycled either; The problems of the solvent extraction method are that the process is long, the process is complicated, and the treatment cost is high. It is only suitable for the oily sludge containing a large amount of refractory organic matter; the chemical demulsification method needs to add a demulsifier and heating for the oily sludge with serious emulsification; The liquid separation method has a low oil recovery rate for oily sludge with high oil content and serious pollution

Therefore, these methods have not been effectively popularized and applied in China.

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