How to handle heavy residue oil in oil refineries?
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As the production cycle lengthens, water removed through electrodesalination and from oil tanks contains oil, which is returned to the wastewater treatment plant via underground oil-containing pipelines for centralized recovery； Heavy oil accumulates at the bottom of the coking cold coke water tank. Both types of contaminated oil contain a high amount of water, making it difficult to separate the oil from the water. I wonder if any experienced forum members have any good methods for dealing with this issue? 1. Internally, attempts were also made to inject quench oil after dehydration in the reboiler at the bottom of the coking contact cooling tower, resulting in severe blockages in the air cooler and the aftercooler at the top of the contact tower. 2. Recycling to specialized tanks for oil storage and transportation for heating and dehydration takes a long time, yields poor results, and the evaporation of oil vapors from the tank tops poses an environmental hazard.
To properly handle this portion of the oil, the water content must first be removed before it can be reprocessed. Here, the waste oil is collected in the oil tank of the coking unit, where it is heated and dehydrated before being fed back into the coke tower as quench oil.