Feeding nozzle of catalytic cracking unit

Abstract

The invention relates to a feeding nozzle of a catalytic cracking unit of an oil refinery. The feeding nozzle comprises an inner tube steam distributor 3, circumferential steam distributing holes 4, an outer tube 5, an annular space mixing cavity 6, top steam distributing holes 7, mixing cavities 8, 10, 12 and 14, reinforcing mixing baffles 10 and 13, a nozzle base body 15, nozzle groups 16 and the like, wherein a spraying section comprises specially designed nozzle groups 16 so as to form flat sector mist spray consisting of multistrand micro jets, thus well covering section of a lifting tube; furthermore, the catalyst can pass through the micro jets, so that the contact area of the oil mist jet flow of the multistrand micro jets and the catalyst is larger, the oil and the catalyst can well contact; as the upstream catalyst and the oil gas penetrate through the sector mist spray and eject through clearances between the micro jets, the catalyst and the oil gas cannot well contact, the catalyst cannot form eddy on the back of the sector jet flow, the hidden danger that the oil gas rewinds and touches the wall surface of the lifting tube so as to coke is eliminated.

Description

technical field [0001] The invention relates to a feed nozzle used for a catalytic cracking device in an oil refinery, belonging to the field of catalytic cracking equipment. Background technique [0002] The riser reactor is the core component of the catalytic cracking process. During the reaction process in the riser reactor, the raw oil enters the reactor through atomization, contacts with the catalyst, is vaporized by heat and reacts under the action of the catalyst. After feeding, the oil and gas generally stay in the reactor for 2-3 seconds. After the reaction is completed, it enters the oil separation system to stop the reaction. This process requires that after the raw oil is atomized into the reactor, it should be in contact with the catalyst quickly and evenly. The shorter the time required for full contact, the better, so as to facilitate the reaction process. In addition, after the contact between the feed and the oil agent is quickly realized, a uniform plug f...

AI Technical Summary

Problems solved by technology

[0007] In addition, for single-jet nozzles, the contact between the feed and the catalyst is good on the upflow surface but the catalyst cannot be contacted on the backflow surface, so that the actual catalyst-to-oil ratio in the reactor is lower than the nominal catalyst-to-oil ratio, or the feed-to-catalyst The micro contacts are not at their best

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