CN102827627B - Multistage atomized heavy oil catalytic cracking anti-coking nozzle - Google Patents
Multistage atomized heavy oil catalytic cracking anti-coking nozzle Download PDFInfo
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Abstract
The invention belongs to a catalytic cracking device in the field of petroleum refining and provides a multistage atomized heavy oil catalytic cracking anti-coking nozzle. The multistage atomized heavy oil catalytic cracking anti-coking nozzle comprises an inner tube (5), an outer tube (3), a shower nozzle (1), a raw oil inlet (14) and a primary steam inlet (15), the raw oil inlet (14) is communicated with a collecting tube chamber (13) and is communicated with a mixing chamber (10) in a shape of a circular truncated cone through a plurality of evenly-distributed raw oil nozzles (12), and the first stage pulverization of raw oil is obtained when the raw oil enters the mixing chamber. The second stage pulverization is carried out on the raw oil in the mixing chamber through primary steam sprayed in the mixing chamber from a primary steam nozzle (11). The third stage pulverization is carried out on the raw oil in the inner tube after the second stage pulverization. A secondary steam spraying hole I (2-2) enables the raw oil to conduct the fourth stage pulverization. The multistage atomized heavy oil catalytic cracking anti-coking nozzle adopts a multistage atomizing mode to strengthen pulverization effects, therefore, coking of the raw oil on the wall of a riser reactor is avoided.
Description
Technical field
The invention belongs to refining of petroleum field catalytic cracking unit, relate generally to a kind of heavy oil fluid catalytic cracking anti-coking nozzle of multistage atomizing.
Background technology
Raw material oil feeding atomizing nozzle is a visual plant of refining of petroleum field catalytic cracking unit, its effect is: first that stock oil is broken, atomization is a large amount of fine drop, again raw material oil droplet is injected in catalytic cracking riser reactor, with catalyst mix in riser reactor, react.
In the last few years, for the raw material oil feeding atomizing nozzle of catalytic cracking unit, the domestic KH type (89207961.9,200420066089.3) that mainly contains the LPC type (90209410.6) of wikipedia type, adopts the two wikipedia types of supersonic atomization steam, there is the BWJ type (98233035.9) of cyclone structure, the broad varietys such as CCK type (99219391.5) that there is the UPC-ɑ type (00109776.8) of porous steam distributor and there is secondary-atomizing structure; External similar technology mainly contain S & W company the exploitation of target spray nozzle, Uop Inc. in establish that many orifice types Optimix nozzle, Mobile company and the Kellogg company of porous steam distributor develop jointly in establish porous steam distributor and baffle plate ATOMAX nozzle, the nozzle that is provided with secondary-atomizing steam of the feed nozzle with nozzle cover that can form flat jet of ABB Lummus company exploitation and the exploitation of Exxon company.
Yet in actual use, said nozzle more or less exists following problem: the one, the atomizing effect of stock oil needs further to be improved; The 2nd, there is coking phenomenon at riser tube inwall in the stock oil being injected in riser reactor by nozzle; The 3rd, by nozzle, sprayed, atomization raw material oil droplet jet velocity too high, make catalyst breakage serious; The 4th, atomizing steam and stock oil influence each other at the inlet zone of introducing nozzle, even occur that stock oil (or atomizing steam) cannot be introduced the situation of nozzle when atomizing steam (or stock oil) pressure surge.
The inventor, by research, has found the mechanism of riser reactor inwall coking.Its reason is: atomization stock oil be injected to riser tube after, under the acting in conjunction of catalyzer, pre-lift vapour, to between riser tube inwall and stock oil jet, form a negative pressuren zone, negative pressure produces injection backflow effect to stock oil itself and catalyzer, makes the two overstand, thereby forms coking at riser tube inwall, once and the coke button on riser tube inwall forms, will be more long-pending larger, and then block riser tube runner, even need to stop production and carry out coke cleaning.
200410010045.3 patent applications that the inventor proposes as one of contriver, propose to arrange three kinds of dissimilar secondary steam spray orifices to strengthen the atomizing effect to stock oil; And steam fumarole is set on shower nozzle, thereby between riser reactor inwall and stock oil jet, form steam curtain screen, to suppress stock oil, be injected to the injection backflow effect to self afterwards in riser tube, reduce the coking of riser tube inwall, and promote the mixing of catalyzer and stock oil.
By research, find, 200410010045.3 weak point is mainly aspect two: the one, on the inwall of nozzle interior regional area, still there is the gathering of oil film, the setting of 200410010045.3 nozzle position steam fumaroles in addition, make it to the variation of operating parameters comparatively " sensitivity ", because 200410010045.3 steam fumaroles are communicated with secondary steam chamber, when fluctuation appears in vapor pressure, flow, when there is fluctuation in stock oil flow even, all may cause catalyzer suck-back, even cause the wearing and tearing of steam fumarole.In addition, the object that 200410010045.3 shower nozzle places arrange steam fumarole is the injection backflow effect to self after suppressing stock oil is injected in riser tube, and its steam fumarole is positioned at 5 ~ 30mm place, material oil outlet top conventionally.And research shows, the prime area that produces this injection backflow is positioned at the edge of material oil outlet jet itself " upper part ", i.e. part between nozzle centerline and extended line thereof and riser tube inwall.Therefore steam fumarole is located to not " radical cure " this injection backflow of material oil outlet top.
Summary of the invention
For solving the problems of the technologies described above, the object of the invention is to propose a kind of heavy oil fluid catalytic cracking anti-coking nozzle of multistage atomizing.
The present invention takes following technical scheme to realize its goal of the invention:
A heavy oil fluid catalytic cracking anti-coking nozzle for multistage atomizing, described nozzle includes inner tube, outer tube, shower nozzle, stock oil entrance and primary steam entrance; Annular cavity looping secondary steam chamber between inner tube and outer tube also arranges secondary steam entrance; Described inner tube has contraction section, aditus laryngis section and expansion section, and the front end of shower nozzle has jet exit; Described stock oil entrance is communicated with on collecting tubule chamber, and by a plurality of uniform, be communicated with the mixing section of truncated cone-shaped with nozzle axis stock oil spout at an angle, make stock oil when entering mixing section, be divided into the thin jet of multiply, because the pressure of stock oil nozzle falls suddenly, make stock oil when spraying into mixing section, obtain first step atomization; The primary steam spout being communicated with described primary steam entrance is communicated with described mixing section, and primary steam is sprayed into mixing section; By primary steam spout spray into primary steam in mixing section to the stock oil in mixing section impact for the first time, fragmentation, make stock oil obtain second stage atomization; Stock oil injection after the atomization of the second stage to inner tube, in inner tube, by primary steam to stock oil further impact, fragmentation, make stock oil obtain third stage atomization; Cavity setting between the corresponding inner tube expansion section exit end of secondary steam spray orifice I and jet exit, make a part of secondary steam via inner tube, flow to the stock oil in cavity between inner tube expansion section exit end and jet exit and mix with above-mentioned, to its further atomization, i.e. fourth stage atomization; Secondary steam spray orifice II corresponding nozzle outlet inwall upper-end part of driving arranges, make a part of secondary steam be injected into outlet inwall upper end position by secondary steam spray orifice II, together by jet exit, enter into riser reactor with secondary steam, primary steam and the stock oil of rest part, steam by secondary steam spray orifice II forms steam curtain and shields between riser reactor inwall and stock oil jet, prevents stock oil coking on riser reactor wall.
Described secondary steam spray orifice comprises secondary steam spray orifice I and secondary steam spray orifice II, and wherein secondary steam spray orifice I is circumferential a plurality of; Described secondary steam spray orifice II is be distributed in upper semicircumference a plurality of, and secondary steam spray orifice II and secondary steam spray orifice I are interspersed.
Described primary steam spout is one, is positioned at the home position of a plurality of stock oil circumference that spout forms.
Described primary steam spout is a plurality of; One of them steam nozzle is positioned at the home position of a plurality of stock oil circumference that spout forms, other primary steam spout is positioned at the outside of stock oil spout and is uniformly distributed along the circumference, and the center of circle of a plurality of primary steam spouts that are uniformly distributed along the circumference overlaps with the center of circle of a plurality of stock oil spouts.
The angle β of the axis of described stock oil spout and inner tube axis is 0 ゜～30 ゜.
The secondary steam spray orifice I being arranged between inner tube expansion section exit end and jet exit has three classes, and secondary steam spray orifice I and the angle between inner tube axis described in three classes are respectively 6 ゜～15 ゜, 15 ゜～40 ゜, 45 ゜～80 ゜.
Angle between secondary steam spray orifice II and inner tube axis is 10 ゜～55 ゜.
Corresponding described primary steam spout is provided with primary steam distributing chamber, and described primary steam distributing chamber is positioned at the front portion of collecting tubule chamber.
Being shaped as of described stock oil spout is circle or rectangle.
The angle β of the axis of described stock oil spout and inner tube axis is 0 ゜～30 ゜.
Described a plurality of secondary steam spray orifice I and the angle between inner tube axis are respectively 6 ゜～15 ゜, 15 ゜～40 ゜, 45 ゜～80 ゜.
With inner tube axis angle Φ 2 be the spray orifice of 6 ゜～15 ゜, effect is to make secondary steam be injected in material oil outlet medullary ray two ends, the oil film forming in this position to destroy stock oil.
With inner tube axis angle Φ 1 be the spray orifice of 15 ゜～40 ゜, effect is that secondary steam is injected on shower nozzle inwall, the oil film forming in this position to destroy stock oil.
With inner tube axis angle Φ 3 be the spray orifice of 45 ゜～80 ゜, effect is that secondary steam is injected between inner tube expansion section exit end and jet exit, to the impact atomization again of the stock oil through mixing section atomization and inner tube atomization.
For prevent ejection after stock oil at nozzle exit area, pile up, the outside of described jet exit has the acute angle edge of a knife of arc.
In order to make to keep optimum velocity from the stock oil of jet exit ejection, prevent that the stock oil that sprays into riser tube from producing backflow because speed is too high, its spread angle of the expansion section of interior tube chamber is 2 ゜～3 ゜; Its angle of throat of the contraction section of interior tube chamber is 2 ゜～3 ゜.
In order to weaken the impact of riser reactor catalyst particles to spray-nozzle type sprinkler head bottom, the bottom of described shower nozzle is an inclined-plane, and the angle σ between this inclined-plane and inner tube axis is 20 ゜～40 ゜.
The form that described primary steam spout and stock oil spout can adopt override formats or directly hole.
The heavy oil fluid catalytic cracking anti-coking nozzle of a kind of multistage atomizing that the present invention proposes, adopts above technical scheme, and than existing nozzle arrangements, the beneficial effect having is as follows:
1, strengthened atomizing effect: at mixing section, adopt the form of a plurality of stock oil spouts that stock oil is divided into multiply, stock oil " successfully " can be carried secretly to inner tube on the one hand, when stock oil is at a high speed by stock oil spout, because pressure falls suddenly, can be realized pressure atomization simultaneously; Form first step atomization; And stock oil is divided into multiply, and make its atomization in mixing section more easy, form the second stage " differential atomization "; Optimized the angle in secondary steam hole, effectively destroyed the oil film of shower nozzle inwall and piled up, eliminated large drop, thereby reach the atomizing particle size of catalytic cracking process requirement,
2, the secondary steam spray orifice II on a plurality of distribution upper semicircumferences is set, with so that secondary steam be injected in to the camber line place of jet exit inwall upper end, and then together spray into riser reactor on stock oil top and stock oil, thereby more effectively form steam curtain screen, suppress stock oil injection and reflux, prevent the coking of stock oil on riser reactor wall.
Accompanying drawing explanation
Fig. 1 is the one-piece construction sectional view of the embodiment of the present invention 1.
Fig. 2 is A-A sectional view in Fig. 1.
Fig. 3 is the C-C sectional view of Fig. 1.
Fig. 4 is the one-piece construction sectional view of the embodiment of the present invention 2.
Fig. 5 is A-A sectional view in Fig. 4.
Fig. 6 is the C-C sectional view of Fig. 4.
Fig. 7 is the left view of Fig. 3, Fig. 6.
Fig. 8 is the one-piece construction sectional view of the embodiment of the present invention 3.
Fig. 9 is A-A sectional view in Fig. 8.
Figure 10 is the C-C sectional view of Fig. 8.
Figure 11 is the left view of Fig. 8.
Figure 12 is the structural representation of secondary steam spray orifice I.
Figure 13 is the structural representation of secondary steam spray orifice I.
Figure 14 is the structural representation of secondary steam spray orifice I.
Figure 15 is the structural representation of secondary steam spray orifice II.
Figure 16 is the vertical view of Figure 12.
In figure, 1, shower nozzle, 2-2, secondary steam spray orifice I, 2-1, secondary steam spray orifice II, 3, outer tube, 4, annular secondary steam chamber, 5, inner tube, 6, expansion section, 7, aditus laryngis section, 8, contraction section, 9, secondary steam entrance, 10, mixing section, 11, primary steam spout, 12, stock oil spout, 13, collecting tubule chamber, 14, stock oil entrance, 15, primary steam entrance, 16, primary steam distributing chamber, 17, inclined-plane, 18, the acute angle edge of a knife, 19, jet exit.
Embodiment
With specific embodiment, the present invention is illustrated by reference to the accompanying drawings;
Embodiment 1
As shown in Figure 1, Figure 2, Fig. 3 in conjunction with Fig. 7, a kind of heavy oil fluid catalytic cracking anti-coking nozzle of multistage atomizing, described nozzle includes inner tube 5, outer tube 3, shower nozzle 1, stock oil entrance 14 and primary steam entrance 15; Annular cavity looping secondary steam chamber 4 between inner tube 5 and outer tube 6, and the side away from spout arranges secondary steam entrance 9 at it; Described inner tube 5 has contraction section 8, aditus laryngis section 7 and expansion section 6, and the front end of shower nozzle has jet exit 19; Described stock oil entrance 14 is communicated with on collecting tubule chamber 13, and by a plurality of uniform, be communicated with the mixing section 10 of truncated cone-shaped with nozzle axis stock oil spout 12 at an angle, make stock oil when entering mixing section, be divided into the thin jet of multiply, because the pressure at stock oil spout 12 places falls suddenly, make stock oil when spraying into mixing section, obtain first step atomization; The primary steam spout 11 being communicated with described primary steam entrance 15 is communicated with described mixing section 10, and primary steam is sprayed into mixing section; In this embodiment, described primary steam spout 11 by be positioned at a plurality of stock oil spouts 12 of the formation circumference center of circle; Primary steam spout 11 is parallel with nozzle axis; By primary steam spout 11 spray into primary steam in mixing section to the stock oil in mixing section impact for the first time, fragmentation, make stock oil obtain second stage atomization; Stock oil injection after the atomization of the second stage to inner tube 5, in inner tube, by primary steam to stock oil further impact, fragmentation, make stock oil obtain third stage atomization; Cavity setting between corresponding inner tube expansion section 6 exit end of secondary steam spray orifice I 2-2 and jet exit 19, make a part of secondary steam via inner tube 5, flow to the stock oil in cavity between inner tube expansion section 6 exit end and jet exit 19 and mix with above-mentioned, to its further atomization, i.e. fourth stage atomization; Secondary steam spray orifice II 2-1 corresponding nozzle exports 19 inwall upper-end part of driving settings, make a part of secondary steam be injected into outlet inwall upper end position by secondary steam spray orifice II 2-1, together by jet exit 19, enter into riser reactor with secondary steam, primary steam and the stock oil of rest part, steam by secondary steam spray orifice II 2-1 forms steam curtain and shields between riser reactor inwall and stock oil jet, prevents stock oil coking on riser reactor wall.
The form that described primary steam spout and stock oil spout can adopt override formats or directly hole.
Working process of the present invention is: the stock oil through heating is entered after nozzle by stock oil entrance 14, first enter into the collecting tubule chamber 13 of nozzle, then via being arranged on around primary steam spout 11, with the axis of primary steam spout 11 (be nozzle axis or inner tube axis at an angle the stock oil spout 12 of β spray into 10 ° of mixing sections; Stock oil spout 12 is 0 °～30 ° with the angle β angle of nozzle axis, and this embodiment is 20 °; The stock oil spout 12 that is arranged on mixing section 10 entrance ends is for a plurality of and be uniformly distributed along the circumference, and this embodiment is 8; Being shaped as of the stock oil spout 12 of mixing-chamber inlet end is circle or rectangle, and this embodiment is circular; Be arranged on the primary steam spout 11 of mixing section 10 entrance ends and the form that stock oil spout 12 can adopt override formats or directly hole, this embodiment all adopts override formats.
At mixing section 10, on the one hand, primary steam forms ejector action to stock oil, and stock oil " successfully " is carried secretly to inner tube 5; On the other hand, at the entrance end of mixing section 10, stock oil is divided into the thin jet of multiply by stock oil spout 12, and while passing through stock oil spout 12 with high speed, pressure falls suddenly, and volumetric expansion forms first step atomization.Simultaneously primary steam mixing section 10 interior to stock oil impact for the first time, broken, form second stage atomization, because stock oil is divided into multiply by stock oil spout, so each stock oil thigh is easy to be carried secretly injection; Also easily realize its atomization process.
In inner tube 5, primary steam carries out further fragmentation, atomization to stock oil, forms third stage atomization.Inner tube 5 is comprised of contraction section 8, aditus laryngis section 7 and expansion section 6 three parts; At contraction section 8, velocity of steam increases, and stock oil is continued fragmentation; After transition through aditus laryngis section 7, at expansion section 6, the mobile of central zone stock oil and steam tends towards stability, and the oil film at wall place, limit is extended thinlyyer.Oil droplet and primary steam together enter into the cavity between inner tube expansion section 6 exit end and jet exit 19.The spread angle of the expansion section 6 of interior tube chamber 5 is 2 ゜ ~ 3 ゜, and the angle of throat of contraction section 8 is 2 °～3 °, and this embodiment is 3 °.
As Fig. 1, Fig. 3, and in conjunction with Figure 12, Figure 13, Figure 14, Figure 15, Figure 16, secondary steam is introduced by secondary steam entrance 9, via the annular steam chamber 4 between inner tube 5 and outer tube 3, then is injected in the cavity between inner tube expansion section 6 exit end and jet exit 19 by secondary steam spray orifice.
From function, secondary steam is divided into two portions, and a part of secondary steam flows to the stock oil in cavity between inner tube expansion section 6 exit end and jet exit 19 via inner tube 5 and mixes with above-mentioned, to its further atomization; On the other hand, part secondary steam is injected into the camber line place (the D place of Fig. 3) of jet exit inwall upper end, this part steam is sprayed by a plurality of secondary steam spray orifice II 2-1 that are only arranged on upper semicircumference, together by jet exit 19, enter into riser reactor with secondary steam, primary steam and the stock oil of rest part, steam by secondary steam spray orifice II 2-1 forms steam curtain and shields between riser reactor inwall and stock oil jet, prevents stock oil coking on riser reactor wall.Particularly, secondary steam spray orifice I 2-2 is a plurality of and circumferentially, described a plurality of secondary steam spray orifice I 2-2 and the angle between inner tube axis are respectively 6 °～15 °, and 15 °～40 °, 45 °～80 °.
As shown in figure 13, with inner tube axis angle Φ 2 be a plurality of secondary steam spray orifice I 2-2 of 6 °～15 °, this embodiment is 6 °, effect is to make secondary steam be injected in jet exit 19 medullary ray two ends, the oil film forming in this position to destroy stock oil.
As shown in figure 12, with inner tube axis angle Φ 1 be a plurality of secondary steam spray orifice I 2-2 of 15 °～40 °, this embodiment is 25 °, effect is that secondary steam is injected on shower nozzle inwall, the oil film forming in this position to destroy stock oil.
As shown in figure 14, with inner tube axis angle Φ 3 be a plurality of secondary steam spray orifice I 2-2 of 45 °～80 °, this embodiment is 45 °, effect is that secondary steam is injected between inner tube expansion section exit end and jet exit, to the impact atomization again of the stock oil through mixing section atomization and inner tube atomization.
As shown in figure 15, and in conjunction with Figure 16, a plurality of secondary steam spray orifice II 2-1 that are 10 °～55 ° with inner tube axis angle Φ 4 are only arranged on upper semicircumference; In this embodiment, as indicated in Figure 16, the number of this type of secondary steam spray orifice II 2-1 is 5, and angle Φ 4 is that 15 ° two, angle Φ 4 are that 25 ° two, angle are of 40 ゜.The effect of secondary steam spray orifice II 2-1 is to make secondary steam be injected in the camber line place (the D place of Fig. 3) to jet exit inwall upper end, and then together spray into riser reactor on stock oil top and stock oil, thereby form, more effectively suppress injection backflow, prevent the coking of stock oil on riser reactor wall.
As Fig. 1, Fig. 3, and in conjunction with Fig. 7, shower nozzle 1 is spherical form, it is arranged on outer tube front end and connects as one with it, shower nozzle front portion has jet exit 19 and the edge of a knife 18, four limits of jet exit adopt circular angle, the spread angle ɑ <60 ° of jet exit, and this embodiment is 20 °; In order to prevent that the stock oil after ejection from piling up at nozzle exit area, the angle <90 ° of the acute angle edge of a knife 18 and nozzle axis, this embodiment is 40 °.
An inclined-plane 17 is set in the bottom of shower nozzle 1, and the angle σ between this inclined-plane and inner tube axis is 20 °～40 °, and this embodiment is 30 °.Can make like this inclined-plane of shower nozzle bottom concordant with riser reactor inwall, thereby weaken the impact of riser reactor catalyst particles to shower nozzle bottom.
Embodiment 2
As Fig. 4, Fig. 5, Fig. 6 and in conjunction with Fig. 7, the major scheme of this embodiment is with embodiment 1, and in this embodiment, primary steam spout is adopted 11 use override formats; And stock oil spout 12 adopts the directly form of boring, the present embodiment is applicable to the situation that stock oil flow is less than 5t/h, now nozzle overall dimension is less, large in mixing section 10 entrance end welding adapter difficulty, but now the thickness of mixing-chamber inlet stomidium plate is not less than 10mm.
Embodiment 3
As Fig. 8, Fig. 9, Figure 10 in conjunction with Figure 11, the major scheme of this embodiment is with embodiment 1, in this embodiment, the difference of this embodiment and embodiment 1 and embodiment 2 is the form of primary steam spout 11 and stock oil spout 12 in mixing section 10 parts, primary steam is introduced by primary steam entrance 15, first enter primary steam distributing chamber 16, via primary steam spout 11, enter mixing section 10 again, the primary steam spout 11 that is arranged on mixing section 10 entrance ends is one or more, this embodiment is 9 (as shown in one heart two annulus in Fig. 9), primary steam spout 11 is parallel with nozzle axis, and employing override formats.
Stock oil through heating is entered after nozzle by stock oil entrance 14, first enters into the collecting tubule chamber 13 of nozzle, then enters mixing section 10 via a plurality of stock oil spouts 12 parallel with primary steam spout; The stock oil spout 12 that is arranged on mixing section 10 entrance ends is for a plurality of and be uniformly distributed along the circumference, and this embodiment is 4, (as shown in single annulus in Fig. 9).Stock oil spout 12 is parallel with nozzle axis, the form that can adopt override formats or directly hole, and this embodiment adopts direct boring form.
The entrance end of mixing section 10 in this embodiment, stock oil is divided into multiply " carefully " jet by stock oil spout 12, and while passing through stock oil spout 12 with high speed, pressure falls suddenly, and volumetric expansion forms first step atomization; Primary steam is divided into multiply by primary steam spout 11; Like this, the surface-area of unit volume steam increases, can by stock oil more " successfully " carry secretly to inner tube 5; And because primary steam is also divided into multiply, the initial contact area of steam and stock oil increases, and has strengthened the effect of second stage atomization in mixing section.
In addition, in primary steam distributing chamber 16, primary steam can conduct heat (conventionally in heavy oil fluid catalytic cracking by tube wall stock oil in primary steam distributing chamber 16 outside tube wall of primary steam jet pipe, vapor temperature is higher than stock oil temperature), make stock oil reduced viscosity, be conducive to its atomization that is broken.
Claims (6)
1. a heavy oil fluid catalytic cracking anti-coking nozzle for multistage atomizing, described nozzle includes inner tube (5), outer tube (3), shower nozzle (1), stock oil entrance (14) and primary steam entrance (15); Annular cavity looping secondary steam chamber (4) between inner tube (5) and outer tube (3) also arranges secondary steam entrance (9); Described inner tube (5) has contraction section (8), aditus laryngis section (7) and expansion section (6), and the front end of shower nozzle has jet exit (19); It is characterized in that: described stock oil entrance (14) is communicated with on collecting tubule chamber (13), and by a plurality of uniform, be communicated with the mixing section (10) of truncated cone-shaped with nozzle axis stock oil spout (12) at an angle, make stock oil when entering mixing section, be divided into the thin jet of multiply, the pressure of locating due to stock oil spout (12) suddenly falls and makes stock oil when spraying into mixing section, obtain first step atomization; The primary steam spout (11) being communicated with described primary steam entrance (15) is communicated with described mixing section (10), and primary steam is sprayed into mixing section; By primary steam spout (11) spray into primary steam in mixing section to the stock oil in mixing section impact for the first time, fragmentation, make stock oil obtain second stage atomization; Stock oil injection after the atomization of the second stage to inner tube (5), in inner tube, by primary steam to stock oil further impact, fragmentation, make stock oil obtain third stage atomization; Cavity setting between corresponding inner tube expansion section (6) exit end of secondary steam spray orifice I (2-2) and jet exit (19), make a part of secondary steam and via inner tube (5), flow to the stock oil in cavity between inner tube expansion section (6) exit end and jet exit (19) and mix, to its further atomization, i.e. fourth stage atomization; Secondary steam spray orifice II (2-1) corresponding nozzle outlet (19) inwall upper-end part of driving arranges, make a part of secondary steam be injected into outlet inwall upper end position by secondary steam spray orifice II (2-1), together by jet exit (19), enter into riser reactor with secondary steam, primary steam and the stock oil of rest part, steam by secondary steam spray orifice II (2-1) forms steam curtain screen between riser reactor inwall and stock oil jet, prevents stock oil coking on riser reactor wall; Described secondary steam spray orifice I (2-2) is circumferential a plurality of; Described secondary steam spray orifice II (2-1) is for to be distributed in a plurality of of upper semicircumference, and secondary steam spray orifice II (2-1) is interspersed with secondary steam spray orifice I (2-2).
2. the heavy oil fluid catalytic cracking anti-coking nozzle of a kind of multistage atomizing according to claim 1, is characterized in that: described primary steam spout (11) is one, is positioned at the home position that a plurality of stock oil spouts (12) form circumference.
3. the heavy oil fluid catalytic cracking anti-coking nozzle of a kind of multistage atomizing according to claim 1, is characterized in that: described primary steam spout (11) is for a plurality of; One of them steam nozzle is positioned at the home position of a plurality of stock oil circumference that spout forms, other primary steam spout is positioned at the outside of stock oil spout and is uniformly distributed along the circumference, and the center of circle of a plurality of primary steam spouts that are uniformly distributed along the circumference overlaps with the center of circle of a plurality of stock oil spouts.
4. the heavy oil fluid catalytic cracking anti-coking nozzle of a kind of multistage atomizing according to claim 1, is characterized in that: the angle β of the axis of described stock oil spout and inner tube axis is 0 ゜～30 ゜.
5. the heavy oil fluid catalytic cracking anti-coking nozzle of a kind of multistage atomizing according to claim 1, it is characterized in that: the secondary steam spray orifice I (2-2) being arranged between inner tube expansion section (6) exit end and jet exit has three classes, angle between secondary steam spray orifice I (2-2) described in three classes and inner tube (5) axis is respectively 6 ゜～15 ゜, 15 ゜～40 ゜, 45 ゜～80 ゜.
6. the heavy oil fluid catalytic cracking anti-coking nozzle of a kind of multistage atomizing according to claim 1, is characterized in that: the angle between secondary steam spray orifice II (2-1) and inner tube (5) axis is 10 ゜～55 ゜.
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| CN201210336614.8A CN102827627B (en) | 2012-09-13 | 2012-09-13 | Multistage atomized heavy oil catalytic cracking anti-coking nozzle |
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| CN201210336614.8A CN102827627B (en) | 2012-09-13 | 2012-09-13 | Multistage atomized heavy oil catalytic cracking anti-coking nozzle |
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| CN105368479B (en) * | 2015-10-16 | 2023-12-19 | 中国石油大学(北京) | Novel glidant technology for promoting oil agent mixing in feeding area of catalytic cracking riser |
| CN105778978B (en) * | 2016-04-15 | 2017-11-17 | 洛阳森德石化工程有限公司 | A kind of application method of the feedstock oil multistage atomizing nozzle arrangements of RFCC |
| CN106010630B (en) * | 2016-06-27 | 2019-01-01 | 石宝珍 | A kind of atomizing nozzle for feeding raw material in catalytic cracking |
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| US4800014A (en) * | 1983-12-02 | 1989-01-24 | Phillips Petroleum Company | Catalytic cracking process |
| CN2717959Y (en) * | 2004-01-31 | 2005-08-17 | 洛阳森泰石化机械有限公司 | Improved secondary steam orifice structure for heavy oil catalytic cracking feeding spray nozzle |
| CN1268718C (en) * | 2004-01-31 | 2006-08-09 | 洛阳森泰石化机械有限公司 | High efficiency atomizing material feeding nozzle for heavy oil catalytic cracking |
| CN200967809Y (en) * | 2006-11-21 | 2007-10-31 | 中国石油化工集团公司 | Heavy oil feeding atomization nozzle |
| CN101307249A (en) * | 2007-05-16 | 2008-11-19 | 徐升 | High-efficiency atomising nozzle for catalytic cracking of dead oil |
| CN201686665U (en) * | 2010-04-14 | 2010-12-29 | 洛阳高新柯恒石化技术有限公司 | Atomizing nozzle used for feeding of heavy oil catalytic cracking unit |
| CN201786132U (en) * | 2010-08-27 | 2011-04-06 | 曹磊 | Inserted pin |
| CN202290379U (en) * | 2011-10-11 | 2012-07-04 | 洛阳瑞昌石油化工设备有限公司 | Heavy oil catalytic cracking spray nozzle with tangential feeding |
-
2012
- 2012-09-13 CN CN201210336614.8A patent/CN102827627B/en active Active
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