Method for recycling water-containing sump oil by utilizing delayed coking device

Abstract

The invention discloses a method for recycling water-containing sump oil by utilizing a delayed coking device. The method comprises the following steps: (1) injecting water-containing sump oil into a steam blowing exhausting pipeline of a coke chamber when the coke chamber of the delayed coking device is subjected to large steam blowing and coke cooling process, wherein the water-containing sump oil is heated by high-temperature oil gas from the coke chamber; (2) gasifying water and light oil fractions in the water-containing sump oil, mixing the gasified water and light oil fractions with cooled oil, oil gas and steam from the coke chamber, and allowing the mixed oil gas to enter an emptying tower; and (3) distilling off the steam and light oil fractions from the top of the emptying tower, condensing, cooling, allowing the steam and light oil fractions to enter a liquid separation tank on the top of the emptying tower, and separating non-condensable gas, light sump oil and sulfur-containing sewage from the liquid separation tank, wherein heavy oil fractions are extracted from the bottom of the emptying tower. According to the method disclosed by the invention, the water-containing sump oil which is difficultly treated in an oil refinery is treated, the cooling load and energy consumption of the coking device are reduced, and the method is not influenced by the properties of the water-containing sump oil. The energy conservation and emission reduction in a refinery plant are promoted, and a certain economic benefits are created for the refinery plant.

Description

technical field [0001] The invention relates to the field of waste oil treatment in refineries, and more specifically, relates to a method for refining water-containing waste oil by using a delayed coking unit. Background technique [0002] Sludge oil will be produced in the abnormal production and normal production process of the refinery, mainly including: equipment start-up and shut down, purging and oil discharge, equipment maintenance, machine pump switching, filter switching oil discharge, oily sewage treatment plant oil cut, sewage tank cut Oil, product sampling and oil discharge, coking cold coke water tank cutting oil, etc. Refinery waste oil includes watery waste oil, heavy waste oil, light waste oil, muddy waste oil, etc. At present, the treatment methods for waste oil in refineries mainly include: waste oil with no water or less water content can be directly sent to the atmospheric and vacuum unit or delayed coking unit fractionation tower for re-refining, and w...

AI Technical Summary

Problems solved by technology

It can be seen that the steam blowing and blowing gas composed of steam and a small amount of oil and gas from the coke tower is condensed and cooled from 180 to 420 ° C to below 180 ° C. It is cooled by an air cooler or a water cooler, which not only causes waste of high temperature heat , but also consume a lot of electricity or cooling water, increasing the energy consumption of the device

Images