Wear Mitigation Technology of Double Venturi Structure Nozzle for Regenerated Flue Gas

Abstract

The invention relates to an abrasion retarding process of a regeneration flue gas double-Venturi-structure spray nozzle, and provides the composition of the regeneration flue gas double-Venturi-structure spray nozzle. Smoke gas and catalysts enter a contraction section of a first Venturi structure and enters a throat passage of the first Venturi structure; the smoke gas and the catalysts are compressed through caliber reduction, and the pressure drop is generated; the smoke gas and the catalysts are accelerated and then enter a diffusion section of the first Venturi structure; the speed is decelerated; the pressure drop generated by the throat passage enables the pressure drop of the diffusion section and a hole plate throat passage of a second Venturi structure to be reduced; the smoke gas and the catalysts in the hole plate throat passage are fast diffused through caliber increase of the diffusion section of the second Venturi structure; the generation of the eddy current intensity in the diffusion section is reduced; the backflow due to eddy current is also prevented; the eddy current abrasion and the direct flushing on the hole plate body and the hole plate throat passage outlet are reduced; the double Venturi structures are used; through the pressure drop added in front of the hole plate by the first structure and the direct flushing of the eddy current at an interference outlet of the second structure on the hole plate body and the spray nozzle throat diameter, the service life is prolonged.

Description

technical field [0001] The invention relates to a nozzle for regenerating the critical flow rate of flue gas, in particular to a wear alleviation process for a regenerating flue gas double Venturi structure nozzle. Background technique [0002] At present, the critical flow rate nozzle is the key component of the catalytic cracking unit to control the pressure balance of the tertiary cyclone separator and to quantitatively enter the flue gas into the chimney. Its working temperature can reach 700°C, the flue gas flow rate can reach 200m / s, and it is eroded by the airflow containing a small amount of catalyst particles. The quality of its working conditions directly affects the efficiency of the three-stage cyclone separator to recover the catalyst, the power generation capacity of the hood and the stable operation of the hood; in the 1990s, a cobalt-based alloy Venturi structure critical flow nozzle was adopted, which became the main application of critical flow nozzles in m...

AI Technical Summary

Problems solved by technology

Cobalt-based alloy Venturi structure critical flow rate nozzles cannot meet the three-year service life cycle, and critical flow rate nozzles with orifice plate structures have become the mainstream again. In recent years, the operating cycle of some catalytic cracking units has been increased to four years or more. New growth requirements; in view of the above reasons, the existing catalytic cracking units in my country have increased the operating cycle to three years, and the cobalt-based alloy Venturi structure critical flow rate nozzle cannot meet the three-year service cycle. A regeneration flue gas double Venturi is now invented Wear Reduction Technology of Inner Structure Nozzle

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