Production method of marine fuel oil

Abstract

The invention discloses a method for producing low-sulfur marine fuel oil. The method comprises the following steps: (1) mixing a residual oil raw material with relatively good properties with an effluent obtained in step (3) and hydrogen, and carrying out a first hydrofining reaction in a fixed bed hydrogenation unit to obtain hydrogenated oil; (2) carrying out normal-pressure fractionation on the hydrogenated oil to obtain hydrogenated normal-pressure residual oil; carrying out vacuum fractionation on the hydrogenated normal-pressure residual oil to obtain hydrogenated vacuum residual oil; (3) mixing part of the hydrogenated vacuum residual oil with a residual oil raw material with relatively poor properties and hydrogen, and carrying out a second hydrofining reaction in an up-flow hydrogenation reactor to obtain an up-flow hydrogenation reactor effluent; and (4) carrying out mild thermal cracking on part of the hydrogenated vacuum residue to obtain a marine fuel oil product. The method can treat inferior residual oil raw materials, can meet the index requirements of sulfur content, viscosity and the like of the product, can control the hydrogenation depth and reduce the processing cost, and meanwhile, the hydrogenated product is used as low-sulfur marine fuel oil, and a peptizing system is stable.

Description

technical field [0001] The invention relates to a process method for producing clean fuel oil from inferior residual oil, in particular to a process method for flexibly producing low-sulfur marine fuel oil by using inferior high-sulfur residual oil as raw material. Background technique [0002] With the increasingly stringent global environmental protection regulations, clean low-sulfur marine fuel oil will become one of the key oil products in the next few years after the upgrading of clean gasoline and diesel and other light oil products. The International Maritime Organization (IMO) "International Convention for the Prevention of Pollution from Ships" stipulates that from January 2020, the sulfur mass fraction of marine fuel oil used for navigation in general areas of the sea will be reduced from the current not more than 3.5% to not more than 0.5%; when navigating in emission control areas, the sulfur content of marine fuel oil should not exceed 0.1%. In the marine fuel...

AI Technical Summary

Problems solved by technology

Along the direction of the liquid phase flow, the reaction temperature gradually increases. The disadvantage of this route is that the hydrogen consumption is high during the hydrogenation process and the amount of hydrogenation is large. Usually, when the sulfur content meets the index, a higher reaction severity is required. Under the condition of high temperature and high pressure, the sulfur content meets the requirements of the indicators, and other indicators such as carbon residues are greatly reduced, the conversion rate is increased, and the processing cost is high.

This method needs to use the conventional residual oil hydrogenation process to reduce the sulfur in the residual oil raw material to less than 1500 wppm. However, due to the substantial increase in production costs due to the addition of a large proportion of diesel and other fractions, it still cannot overcome the poor quality of the conventional residual oil hydrogenation process. The production cycle of residual oil raw materials is short, the difficulty of product reconciliation increases, the process is complicated, and the economy is poor

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