Device for blending catalytic slurry oil in delayed coking technology and method thereof

Abstract

The invention provides a device for blending catalytic slurry oil in delayed coking technology. The device comprises a slurry oil tank, a slurry oil pump and a slurry oil heating furnace, which are individually arranged, the slurry oil tank, the slurry oil pump and the slurry oil heating furnace are connected one by one, and the outlet of the slurry oil heating furnace is connected to the outlet of an oil slag heating furnace of a delayed coking device. The invention also provides a method for blending catalytic slurry oil in delayed coking technology by utilizing the device. The method comprises following steps: (1) high-temperature catalytic slurry oil is transported to a slurry oil tank by a catalytic cracking unit, then is transported to a slurry oil heating furnace by a slurry oil pump, and is heated to the temperature of 505 to 550 DEG C; (2) the high-temperature coking oil heated by the slurry oil furnace is mixed with the high-temperature coking oil in the outlet of the oil slag heating furnace of the delayed coking device, and then the mixture is transported to a coke drum to have consequent reactions. The device for blending catalytic slurry oil in delayed coking technology realizes individual temperature control of the oil slurry heating furnace outlet, increases the liquid yield of the coke drum and reduces the coke yield. The whole equipment abrasion and corrosion are changed to part abrasion and corrosion, so the maintenance cost of the equipment is reduced, and the general efficiency of the delayed coking device is improved.

Description

technical field [0001] The invention relates to the field of delayed coking technology in the petrochemical industry, in particular to a device and method for blending catalytic oil slurry in the delayed coking technology. Background technique [0002] As the world's crude oil tends to be more and more heavy and the market demand for light fuel oil increases, the balanced utilization and processing of vacuum residue is a major issue that is generally concerned by the world's oil refineries. Hydrogenation and decarbonization are two different ways to lighten residual oil. Delayed coking, as the most thorough thermal cracking process for decarburization, has always been the world's leading light oil lightening process due to its high yield of light oil and low investment cost. the main way. [0003] At present, the delayed coking process at home and abroad is mainly composed of heating part, green coke part and fractionation part. Its main equipment includes raw material buf...

AI Technical Summary

Problems solved by technology

[0010] First, due to the high carbon residue and high asphaltene content of residual oil, it is easy to coke under high temperature conditions, which affects the heat transfer in the furnace tube and the operating cycle of the heating furnace. The temperature at which the catalytic oil slurry and residual oil are heated together is limited by the coking temperature of residual oil In addition, the catalyst powder in the catalytic oil slurry can promote the coking of the residual oil. When the catalytic oil slurry and the residual oil are heated together, the furnace outlet temperature is controlled to be lower than the temperature of the independent residual oil heating, thereby reducing the heating furnace outlet temperature. It will reduce the heat given by coking and cracking, resulting in a decrease in the liquid yield of the coking unit;

[0011] Second, since the catalytic oil slurry is a by-product of the high-temperature catalytic reaction, only slight cracking is carried out at the temperature of 500°C in the coking furnace, and a large amount of high-aromatic hydrocarbons will It cannot be released by thermal cracking within a certain period of time. In the end, only part of it can be deposited in coke, and part of it enters the catalytic cracking unit with the coking wax oil. Increase and failure to maximize revenue, the volatile content in coke is basically above 10%, which has seriously affected the overall efficiency of delayed coking units for a long time;

[0012] Third, in order to quickly solve the oil slurry outlet problem, oil refineries use catalytic oil slurry mixed into the residual oil heating furnace to feed. Since the catalytic oil slurry contains a large number of high-hardness catalyst particles, the blending ratio must be controlled, otherwise The existing heating furnace tubes, heat exchangers, raw oil pumps, and heating furnace feed pumps are difficult to withstand the rapid wear of catalyst particles, which affects the long-term operation of the residual oil delayed coking unit, resulting in reduced processing capacity, increased unit consumption, and long maintenance cycles. Long series of questions

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