CN205635496U - Feeding nozzle of catalytic cracking unit - Google Patents

Abstract

The utility model relates to a petroleum processing trade feeding nozzle of catalytic cracking unit, feed nozzle includes baffle (7), inner tube top (6) before raw oil entry (2), atomizing steam inlet (1), outer tube (3), inner tube (12), steam distribution hole (8), the hole, first intensive hybrid module (4), and hybrid module (5) are strengthened to the second, one time hybrid chamber (10), secondary hybrid chamber (11) and shower nozzle (9). The utility model discloses in one time hybrid chamber (10) and secondary hybrid chamber (11), make steam jet out with the microjet form from steam distribution hole (8), baffle (7) form the striking before by the hole climbs a class raw oil, form even tiny atomizing raw materials, then striking atomizing once more in secondary hybrid chamber (11), make through nozzle spun raw oil evenly tinyly, thereby fully contact with the catalyst that rises in the riser, the heat transfer, make cracking go on fast, can improve microcosmic agent oil ratio, improve the productivity of light oil, reduce the green coke. The utility model discloses the catalytic cracking unit of mainly used petroleum processing trade.

Description

Catalytic cracking unit feed nozzle

Technical field

This utility model relates to a kind of for PETROLEUM PROCESSING industry catalytic cracking unit feed nozzle, belongs to catalytic cracking and sets Standby field.

Background technology

Along with developing rapidly of catalytic cracking technology, people are intended to obtain higher economic benefit from crude oil refinery: As improved the productivity of decompression residuum, heavy raw oil is used to carry out catalytic cracking.And heavy oil or RFCC, due to former The ratio of material is great, viscosity big, and tenor and green coke amount are high, and cracking reaction is the most difficult, often due to response system green coke amount Greatly, and causing regenerative system carbon-burning load excessive, regeneration temperature is difficult to steadily and controls, and affects the operation of device.

Riser reactor is the core component of catalyzed cracking processing device.In riser reactor course of reaction, former Material oil through atomization enter reactor, contact with catalyst, be heated vaporize and fast reaction under catalyst action.After charging Oil gas the most typically stops the 2-3 second, enters oil preparation piece-rate system, stopped reaction after completing reaction.This technique mistake Range request raw oil is after atomization enters reactor, it should carry out quickly and uniformly contacting with catalyst, is fully contacted required Time the shortest more good, be beneficial to the carrying out of course of reaction.Therefore it is accomplished by raw oil to carry out before entering riser reactor Sufficiently atomization.Because the quality of feed nozzle performance plays obvious action to cracking reaction, product slates, so both at home and abroad New and effective catalytic cracking unit feed nozzle is being continually developed always and released to related research institutes, to adapt to catalytic cracking The needs of technology development also obtain bigger economic benefit.

General atomizing feed nozzle, is all made up of hybrid chamber and ejection section.In hybrid chamber, the liquid being atomized is with auxiliary The steam helping atomization meets, mutual shearing splitting, forms the two phase flow mutually blended, and the most this two phase flow is by ejection section Spout sprays.These nozzles are substantially and utilize fluid dynamic flow stability theory, produce as far as possible in hybrid chamber The big biphase speed difference of vapour (gas) liquid, reaches the purpose of tear and fracturing fluid.

The catalytic cracking nozzle used at present both at home and abroad is roughly divided into following a few class: the first kind is wikipedia type or at it On the basis of improve, its feature be exactly utilize convergence, expansion venturi form improve as far as possible gas flow rate and gas-liquid two-phase speed Degree difference strengthens the shearing splitting of liquid, reaches to improve atomization intensity (seeing CN2069757U)；Equations of The Second Kind is target spray nozzle, and it is former Reason is that feed oil forms high-speed jet shock metallic target under High Pressure Difference effect, then carries out mist for the first time with crossflow effect Change, form gas-spray two-phase flow, finally accelerate at shower nozzle nozzle, it is achieved secondary-atomizing.This nozzle atomization intensity is high, but needs relatively High feed pressure and more atomizing steam, if not reaching requirement, nozzle is just difficult to normally work, and atomizing effect is drastically disliked Changing, not only energy consumption is higher, also makes operating flexibility be affected, thus the investment adding production cost and scrap build (sees US4434049)；3rd class is hybrid feed nozzle (seeing CN2054461U) in double venturi；4th class is that two-fluid is centrifuged Formula nozzle (sees CN2356752Y), wherein have employed biphase cyclone.But the nozzle of these types, the atomizing particle size of charging Relatively big, Suo Taier diameter (cold examination) is mostly more than 60 microns.Later, CN105018131A, CN203683478U, It is all improved by the patents such as CN203999509U, but this distribution of steam hole easily blocks, and affects atomizing effect.

Utility model content

The purpose of this utility model is just to provide a kind of catalytic cracking unit feed nozzle, to solve existing catalytic cracking Device feed nozzle atomized feed elaioleucite footpath is relatively big, and atomizing steam uses the higher problem of pressure.By the special inner tube of design and Hybrid chamber, can form highly uniform tiny drop, thus be fully contacted with catalyst, improves oil product distribution, improves oil product Productivity.

For reaching above-mentioned purpose, the technical solution adopted in the utility model is:

Described feed nozzle includes raw oil entrance 2, atomizing steam entrance 1, outer tube 3, inner tube 12, distribution of steam hole 8, hole Front apron 7, inner tube top 6, first are strengthened electric hybrid module 4, second and are strengthened electric hybrid module 5, mixed once chamber 10, secondary hybrid chamber 11 and shower nozzle 9, described outer tube 3 is provided with raw oil entrance 2, and one end of outer tube 3 is provided with atomizing steam entrance 1, another of outer tube 3 End is provided with shower nozzle 9, and described atomizing steam entrance 1 is connected with one end of inner tube 12, and the other end of inner tube 12 is inner tube top 6, inner tube 12 pipe section has the plurality of rows of circumferentially uniform or circumferential distribution of steam hole 8 of uneven distribution, divides at steam The atomizing steam entrance 1 direction row in cloth hole 8 has the hole front apron 7 of correspondence, and described outer tube 3 inner wall shower nozzle 9 direction is provided with the last the second Changing electric hybrid module 5, be secondary hybrid chamber 11 between the second strengthening electric hybrid module 5 and shower nozzle 9, described outer tube 3 inwall raw oil enters Mouth 2 directions are provided with the first strengthening electric hybrid module 4, are once to mix between the first strengthening electric hybrid module 4 and the second strengthening electric hybrid module 5 Close chamber 10.

Paired distribution of steam hole 8 and uniform or uneven being circumferentially distributed in inner tube 12 of hole front apron 7, be divided into 1-N arranges (circle), depends on the circumstances；The scope of distribution of steam hole 8 centrage and inner tube 12 centrage angle γ at 20 °～ 90 °, the scope of hole front apron 7 centrage and inner tube 12 centrage angle β is at 20 °～75 °；The diameter in distribution of steam hole 8 Scope is at 5mm～12mm, and all distribution of steam holes 8 area sum should account for and be in mixed once chamber 10 the 0.6 of inner tube surface area ～0.8 times, the area of single hole front apron 7 should be 1～1.5 times of single distribution of steam hole 8 area.

The principle of atomization is that atomizing steam carries out fierce cutting to raw oil owing to there is obvious gas-liquid two-phase speed difference The raw oil that tearing is split and made viscosity big splits into droplet.This utility model feed nozzle is by the first strengthening electric hybrid module 4 The direction of advance of feed change oil and speed, stop the most again with hole when front apron 7 and divide the raw oil advanced so that be former Material oil is by passing through with thin layer form time above distribution of steam hole 8, strong with the microjet of very fast ejection from distribution of steam hole 8 With raw oil collision and shearing splitting raw oil, owing to microjet has the component velocity identical with raw oil direction of advance, So atomizing can be played with relatively long distance.When by the second strengthening electric hybrid module 5, the direction of advance of raw oil is again Changing, then from inner tube top 6, steam out can play the effect of secondary-atomizing.This utility model feed nozzle is exactly structure Make repeatedly speed difference and shearing splitting so that raw oil can be sufficiently atomized into the most tiny granule, then is sprayed by shower nozzle After going out to enter riser reactor with rising and the catalyst that comes is fully contacted, heat transfer uniformly and rapidly, reduces microcosmic agent oil Ratio, improves oil quality and productivity.

Accompanying drawing explanation

Fig. 1 is this utility model feed nozzle structural representation.

In Fig. 1,1. atomizing steam entrance；2. raw oil entrance；3. outer tube；4. the first strengthening electric hybrid module；5. the last the second Change electric hybrid module；6. inner tube top；7. hole front apron；8. distribution of steam hole；9. shower nozzle；10. mixed once chamber；Mix for 11. 2 times Close chamber；12. inner tubes.

Fig. 2-1 is this utility model distribution of steam hole 8 and the hole front apron 7 structural representation in inner tube 12.

Fig. 2-2 is this utility model distribution of steam hole 8 distribution schematic diagram in inner tube 12.

Fig. 3 is the feed nozzle structural representation that this utility model only has the second strengthening electric hybrid module 5.

Detailed description of the invention

Catalytic cracking unit feed nozzle of the present utility model is illustrated by Fig. 1 below in conjunction with the accompanying drawings, it is clear that described Embodiment be only a part of embodiment of the present invention rather than whole embodiments.Based on embodiment of the present utility model, All other embodiments that those of ordinary skill in the art are obtained on the premise of not making creative work, broadly fall into this The scope that utility model is protected.

Atomizing steam is entered by atomizing steam entrance 1, has completely due to inner tube top 6 or part baffle plate blocks, make Obtain overpressure to increase, force the distribution of steam hole 8 that atomizing steam passes through to be covered with in inner tube 12 with very fast microjet form spray Go out.Raw oil enters outer tube 3 inner chamber by raw oil entrance 2, changes direction with big by the first strengthening electric hybrid module 4 for the first time Little, simultaneously enter mixed once chamber 10, at the porose front apron in this region 7, stop the flow direction changing raw oil so that flowing State is more disorderly, adds by distribution of steam hole 8 very fast atomizing steam out, under the effect of gas-liquid two-phase speed difference, Making raw oil that atomization for the first time occur, owing to having crossed the first strengthening electric hybrid module 4, inner chamber becomes big, and raw oil speed somewhat drops The low atomizing steam being simultaneously mingled with bubble shape advances, simultaneously by the puncturing of microjet in flowing front, the bubble being mingled with The atomizing steam of shape is also carried out rupturing so that raw oil more tears into tiny drop.Owing to the second strengthening electric hybrid module 5 is wanted Bigger than the first strengthening electric hybrid module 4, thus big to raw oil speed and direction knots modification, add the mist out from inner tube top 6 Change steam the most more, it is possible to make raw oil carry out secondary-atomizing.The most just can enter riser by shower nozzle to react Device carries out cracking reaction with the catalyst of rising.

Embodiment described above, the one of detailed description of the invention the most of the present utility model, those skilled in the art The usual variations and alternatives carried out in the range of technical solutions of the utility model all should be included in protection domain of the present utility model Within.

The non-detailed portion of this utility model is prior art, is not therefore described further.

Claims (4)

1. a catalytic cracking unit feed nozzle, it is characterised in that described feed nozzle includes that raw oil entrance (2), atomization are steamed Vapour entrance (1), outer tube (3), inner tube (12), distribution of steam hole (8), hole front apron (7), inner tube top (6), the first strengthening mixing Assembly (4), the second strengthening electric hybrid module (5), mixed once chamber (10), secondary hybrid chamber (11) and shower nozzle (9), described outer tube (3) being provided with raw oil entrance (2), one end of outer tube (3) is provided with atomizing steam entrance (1), and the other end of outer tube (3) is provided with spray Head (9), described atomizing steam entrance (1) is connected with one end of inner tube (12), and the other end of inner tube (12) is inner tube top (6), inner tube (12) pipe section has the plurality of rows of circumferentially uniform or circumferential distribution of steam hole (8) of uneven distribution, Atomizing steam entrance (1) the direction row in distribution of steam hole (8) has the hole front apron (7) of correspondence, described outer tube (3) inner wall shower nozzle (9) direction is provided with the second strengthening electric hybrid module (5), is secondary hybrid chamber between the second strengthening electric hybrid module (5) and shower nozzle (9) (11), described outer tube (3) inwall raw oil entrance (2) direction is provided with the first strengthening electric hybrid module (4), the first strengthening electric hybrid module (4) it is mixed once chamber (10) between and the second strengthening electric hybrid module (5).

Catalytic cracking unit feed nozzle the most according to claim 1, it is characterised in that said inner tube top (6) are flat boards Shape, hemispherical or elliposoidal.

Catalytic cracking unit feed nozzle the most according to claim 1 and 2, it is characterised in that described distribution of steam hole (8) Circular or oval, the scope of distribution of steam hole (8) centrage and inner tube (12) centrage angle γ at 20 °～ 90 °, the diameter range of distribution of steam hole (8) is at 5mm～12mm, and all distribution of steam hole (8) area sums should account for and be in once In hybrid chamber (10) 0.6～0.8 times of inner tube surface area.

Catalytic cracking unit feed nozzle the most according to claim 1 and 2, it is characterised in that described hole front apron (7) is Circle or rectangle, the area in single hole front apron (7) should be 1～1.5 times of single distribution of steam hole (8) area, Kong Qian The scope of baffle plate (7) centrage and inner tube (12) centrage angle β is at 20 °～75 °.