Process for atomizing FCC feed oil
AssigneeExxonMobil Research and Engineering Company
InventorsRussell J. Koveal, Jackson I. Ito
Life of this patent
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Abstract
A liquid atomization process comprises forming a two-phase fluid mixture of a liquid and a gas, under pressure, dividing the fluid into two separate streams which are passed into and through an impingement mixing zone in which they are impingement mixed to form a single stream of two-phase fluid. The mixed, single stream is then passed into and through a shear mixing zone and then into a lower pressure expansion zone, in which atomization occurs to form a spray of atomized drops of the liquid. The impingement and shear mixing zones comprise respective upstream and downstream portions of a single fluid passageway in a nozzle. This is useful for atomizing the hot feed oil in an FCC process.
Claims8
A process for forming a spray of liquid droplets comprising the steps of:
- (a) forming at least two streams of a two-phase fluid comprising a gas phase and a liquid phase;
- (b) passing said streams to an impingement mixing zone wherein at least a portion of each stream is impinged against at least a portion of another stream and wherein the included angle between the impinged streams is between about 120° and 240° to form a single mixed stream;
- (c) passing said single mixed stream to a shear mixing zone and imparting shear mixing forces to said single mixed stream to form a shear mixed stream;
- and,
- (d) passing said shear mixed stream to an atomizing zone wherein said gas phase expands and increases the surface area of said liquid phase, thereby producing a spray of liquid droplets.
A process for forming a spray of liquid droplets comprising the steps of:
- (a) forming at least two streams of a two-phase fluid comprising a gas phase and a liquid phase;
- (b) passing said streams through at least one fluid entrance having a cross-sectional area;
- (c) passing said streams into an expansion zone;
- (d) passing said streams to an impingement mixing zone wherein at least a portion of each stream is impinged against at least a portion of another stream and wherein the included angle between the impinged streams is between about 120° and 240° to form a single mixed stream;
- (e) passing said single mixed stream to a shear mixing zone and imparting shear mixing forces to said single mixed stream to form a shear mixed stream;
- (f) passing said single mixed stream through an orifice having a cross-sectional area less than sum of the cross-sectional area of said at least one fluid entrance;
- (g) passing said shear mixed stream to an atomizing zone wherein said gas phase expands and increases the surface area of said liquid phase, thereby producing a spray of liquid droplets.
A process for forming a spray of liquid droplets comprising the steps of:
- (a) forming a plurality of streams of a two-phase fluid comprising a gas phase and a liquid phase;
- (b) passing said streams through at least one fluid entrance having a cross-sectional area;
- (c) impinging at least a portion of each stream against at least a portion of another stream to form a single mixed stream, wherein the included angle between the impinged streams is between about 120° and 240°;
- (d) subjecting said single mixed stream to shear mixing forces, thereby forming a shear mixed stream;
- (e) passing said shear mixed stream through an atomizer having a cross-sectional area less than the sum of the cross-sectional area of said at least one fluid entrance;
- (f) expanding said gas phase in said shear mixed stream, thereby producing a spray of liquid feed droplets.
Dependencies are inferred from the claim text.