Adding substance for reducing furnace tube deposition coking and improving liquid yield of delayed coker

Abstract

An additive, which is used for delaying device coking, reducing the scaling and coking of furnace tubes and improving the yield of liquids, comprises the raw materials by the weights and portions of: 5-20 portions of ash-less nonmetal dispersant, 5-20 portions of pyrolysis initiator, 25-35 portions of inhibitor, 10-30 portions of antifoulant and 5-20 portions of solvent, wherein, the ash-less nonmetal dispersant is made by the methods that: alcohol amine and fatty acid are mixed by molecular ratio of 1:0.7-1.7, and stirred in the temperature of 170 DEG C-200 DEG C, water produced in the reaction is carried out by toluene or gasoline, and the reaction can be stopped when no more water is produced, and the ash-less nonmetal dispersant is obtained when the toluene or gasoline are steamed. When used in the coking delaying, the additive provided by the invention has the advantages of simple operation, good effects of reducing coke and scale, high general liquid yield, and good economical and technical benefits.

Description

Additive for delayed coking unit to reduce fouling and coking of furnace tube and increase liquid yield technical field The invention belongs to the field of oil refining additives, in particular to an additive used in a delayed coking unit to reduce fouling and coking of furnace tubes and improve liquid yield. Background technique Delayed coking is a thermal processing process that converts vacuum residue oil into gas, liquefied gas, liquid oil (gasoline, diesel, wax oil) and coke through deep thermal cracking. It is a process for refineries to increase light oil yield and produce petroleum coke (CHx, where x<1) means the primary. Compared with residual oil hydrocracking and heavy oil catalytic cracking, delayed coking has the advantages of less equipment investment, simple production process and low operating cost. Delayed coking is the preferred process for deep processing of heavy oil at home and abroad. One of the important goals of the process technology improv...

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Problems solved by technology

However, due to the lack of ashless non-metallic dispersant, the additive has no effect on reducing the adhesion of solid substances to the wall of the furnace tube (including the oil transfer line from the furnace outlet to the coke tower) and inhibiting the formation of coke and dry gas. very ideal

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