Nozzle for riser of catalytic cracking unit and application thereof

Abstract

The invention discloses a nozzle for a riser of a catalytic cracking unit and application of the nozzle. The nozzle comprises: a main nozzle body, wherein the main nozzle body is a two-layer sleeve, two ends of the two-layer sleeve are a first end and a second end respectively, the first end of an inner pipe is provided with a raw oil inlet, the first end of an outer pipe is provided with a dispersion medium inlet, and the second end of the outer pipe protrudes a certain distance from the second end of the inner pipe; a first nozzle head, which is connected with the second end of the inner pipe, wherein the cross section area of the first nozzle head gradually decreases along a direction from position near the inner pipe to position far away from the inner pipe; and a second nozzle head, which is connected with the second end of the outer pipe, wherein the cross section area of the second nozzle head gradually decreases along a direction from position near the outer pipe to position far away from the outer pipe, and protrusions are arranged on the inner wall of the outer pipe. The nozzle provided by the invention is more beneficial for shearing oil gas molecules, so the atomizationrate of sprayed raw oil is greatly improved, and the generation of products with low additional value is reduced.

Description

technical field [0001] The invention relates to a nozzle for a riser of a catalytic cracking device and its application. Background technique [0002] The task of the feed atomizing nozzle is to atomize the raw oil (heavy oil or residual oil or its mixture) and the re-refined oil of the catalytic cracking unit into fine droplets and spray them into the riser. At the temperature in the riser, the raw oil is vaporized and A cracking reaction occurs under the action of a catalyst, and then passes through a separation device to separate oil, gas and chemicals into the next process. [0003] General feed atomization nozzles are composed of a mixing chamber and a spray section. In the mixing chamber, the atomized liquid and the auxiliary atomized steam meet, shear and tear each other to form a two-phase flow mixed with each other, and then the two-phase flow is sprayed out through the nozzle of the discharge section. These nozzles basically use the flow stability theory of fluid...

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a nozzle for the riser of a catalytic cracking unit and its application, so as to overcome the unsatisfactory shape of the droplets sprayed by the nozzle in the prior art, and the defects such as easy blockage during the spraying process.

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