Atomizing nozzle for catalytic cracking device

Abstract

The invention provides an atomizing nozzle for a catalytic cracking device. The atomizing nozzle comprises a nozzle main body, and the nozzle main body is a three-layer casing pipe composed of an inner pipe, a main pipe and an outer pipe; the two ends of the three-layer casing pipe are an inlet end and an outlet end respectively, the inlet end of the inner pipe is located outside the main pipe, the outlet end of the inner pipe is located inside the main pipe, the outer pipe is arranged on the outer wall of the main pipe, and the inlet end and the outlet end of the outer pipe are both located outside the main pipe; a first nozzle head is arranged at the outlet end of the inner pipe, and the cross section area of the first nozzle head is gradually reduced in the direction away from the innerpipe; a second nozzle head is arranged at the outlet end of the main pipe, the cross section area of the second nozzle head is gradually reduced in the direction away from the main pipe, and the longitudinal section of the second nozzle head is semicircular; a third nozzle head is arranged at the outlet end of the outer pipe; at least one bulge is arranged on the outer wall of the inner pipe.

Description

technical field [0001] The invention relates to an atomizing nozzle, in particular to an atomizing nozzle for a catalytic cracking device. 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 stabili...

AI Technical Summary

Problems solved by technology

This spray increases the area of ​​the raw material droplets, which is beneficial to the contact between the raw material droplets and the catalyst particles, however, the existing nozzles are difficult to obtain the desired performance

Some nozzles utilize very small openings or complex head designs, which are easily clogged by various impurities in the raw material. Downtime and replacement costs are very disadvantageous in the process of repairing such clogging. Existing nozzles cannot produce Fine droplets and / or ideal spray patterns

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