Delayed coking reaction process capable of reducing foam

Abstract

The invention relates to a delayed coking reaction process method for reducing foam, comprising: delayed coking feed is heated to the delayed coking reaction temperature through a heating furnace, and then sent to a coking reaction tower for delayed coking reaction, and the delayed coking reaction product enters a fractionation tower to obtain Coked gasoline, coked diesel oil and coked wax oil, partly coked diesel oil and partly coked wax oil are mixed with coking raw materials as coking feed, and the mass ratio of coked diesel oil mixed with coking raw materials to discharged coked diesel oil is called coked diesel oil circulation ratio, and The mass ratio of coking wax oil mixed with coking raw materials to discharged coking wax oil is called the coking wax oil circulation ratio, the coking diesel oil circulation ratio is 0.1:1~1:1, and the coking wax oil circulation ratio is 0.1:1~1:1 . Compared with the prior art, the present invention can effectively suppress the generation of foam in the delayed coking reaction tower, reduce the added amount of the defoamer, and reduce the pollution of the organosilicon defoamer to the downstream hydrogenation catalyst.

Description

technical field [0001] The invention relates to a delayed coking reaction method for suppressing foam in a delayed coking reaction tower, in particular to an improved process for suppressing foam formation in a delayed coking reaction tower by changing the composition of delayed coking circulating oil. Background technique [0002] Delayed coking is a thermal processing process for deep cracking of residual oil into coker dry gas, coker gasoline, coker diesel oil, coker gas oil and coke. The raw material residue of delayed coking contains natural surfactant, which makes a large amount of foam in the coking reaction tower during the delayed coking process, forming a very high foam layer. The foam layer contains a large amount of coke powder. When the coke layer in the coke tower rises to a certain height in the later stage of coking, the foam layer will be carried from the oil and gas pipeline at the top of the coke tower to the fractionation tower together with the coke oil ...

AI Technical Summary

Problems solved by technology

The defoamer does not contain any silicon element, and will not affect the downstream hydrogenation process and the quality of the final light oil product, but the disadvantage is that the active components are not enough, and the penetration and diffusion in the tower are slow, so the addition amount is large, The cost is higher than that of silicone defoamers, while the high temperature resistance is poor, and the defoaming efficiency is low at high temperatures

[0007] US5667669 provides a method of replacing silicon-containing defoamers with animal and vegetable oils and polyisobutylene, which not only increases the cost of defoaming, but also has a general defoaming effect

US4961840 proposes to mix polysilazane with inert gas and directly inject it to reduce the foam of the coke tower. The injection method is to inject from the top of the coke tower. The inert gas is used as an accompanying gas to control the viscosity of polysiloxane and prevent The injection port is blocked, but it has little effect on reducing the silicon content

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