CN102827627A - 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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- CN102827627A CN102827627A CN2012103366148A CN201210336614A CN102827627A CN 102827627 A CN102827627 A CN 102827627A CN 2012103366148 A CN2012103366148 A CN 2012103366148A CN 201210336614 A CN201210336614 A CN 201210336614A CN 102827627 A CN102827627 A CN 102827627A
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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 CCU, relate generally to a kind of RFCC anti-coking nozzle of multistage atomizing.
Background technology
The raw oil atomizing feed nozzle is a visual plant of refining of petroleum field CCU; Its effect is: at first that raw oil is broken, atomizing is a large amount of fine drop; Again the raw material oil droplet is injected in the catalytic cracking riser reactor, with catalyst mix, the reaction in the riser reactor.
In the last few years; The raw oil atomizing feed nozzle that is used for CCU, the domestic LPC type (90209410.6) that mainly contains wikipedia type, adopt the two wikipedia types of supersonic atomization steam KH type (89207961.9,200420066089.3), have the BWJ type (98233035.9) of cyclone structure, the CCK type broad varietys such as (99219391.5) that has the UPC-ɑ type (00109776.8) of porous steam distributor and have the secondary-atomizing structure; External similar technology then 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 the ATOMAX nozzle of porous steam distributor and baffle plate, the feed nozzle that has nozzle cover that can form flat jet of ABB Lummus company exploitation and the nozzle that is provided with secondary-atomizing steam of Exxon company exploitation.
Yet in actual use, said nozzle more or less exists following problem: the one, and the atomizing effect of raw oil remains further to be improved; The 2nd, the raw oil that is injected in the riser reactor by nozzle coking phenomenon occurs at the riser tube inwall; The 3rd, too high by raw material oil droplet projection velocity nozzle ejection, that atomized, make catalyst breakage serious; The 4th, atomizing steam and raw oil influence each other at the inlet zone of introducing nozzle, even occur when atomizing steam (or raw oil) pressure surge, and raw oil (or atomizing steam) can't be introduced the situation of nozzle.
The inventor has found the mechanism of riser reactor inwall coking through research.Its reason is: the raw oil that has atomized is injected to after the riser tube, at catalyzer, promote under the acting in conjunction of vapour in advance, will between riser tube inwall and raw oil jet, form a negative pressuren zone; Negative pressure produces injection backflow effect to raw oil itself and catalyzer, makes the two overstand, thereby forms coking at the riser tube inwall; And the coke button on the riser tube inwall is in case form; Will be long-pending more big more, and then block the riser tube runner, even need stopping production to carry out coke cleaning.
200410010045.3 patented claims that the inventor proposes as one of contriver propose to be provided with three kinds of dissimilar secondary steam spray orifices to strengthen the atomizing effect to raw oil; And steam fumarole is set on shower nozzle; Thereby between riser reactor inwall and raw oil jet, form the steam curtain screen; To the injection backflow effect of self, reduce the coking of riser tube inwall after being injected in the riser tube with inhibition raw oil, and promote the mixing of catalyzer and raw oil.
Through discovering; 200410010045.3 weak point mainly aspect two: the one, still have the gathering of oil film on the inwall of nozzle interior regional area; Then be 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 the secondary steam chamber; When fluctuation appears in vapor pressure, flow; Even the raw oil flow all possibly cause the catalyzer suck-back, even cause the wearing and tearing of steam fumarole when fluctuation occurring.In addition, the purpose that 200410010045.3 shower nozzle places are provided with steam fumarole is after suppressing raw oil is injected in the riser tube that to the injection backflow effect of self, its steam fumarole is positioned at 5 ~ 30mm place, material oil outlet top usually.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 the riser tube inwall.Therefore steam fumarole is located at 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 objective of the invention is to propose a kind of RFCC anti-coking nozzle of multistage atomizing.
The present invention takes following technical scheme to realize its goal of the invention:
A kind of RFCC anti-coking nozzle of multistage atomizing, described nozzle include interior pipe, outer tube, shower nozzle, raw oil inlet and primary steam inlet; Annular cavity looping secondary steam chamber between interior pipe and the outer tube also is provided with the secondary steam inlet; Pipe has contraction section, aditus laryngis section and expansion section in described, and the front end of shower nozzle has jet exit; Described raw oil inlet is communicated with on the collecting tubule chamber; And through a plurality of that be uniformly distributed with, be communicated with the mixing section of truncated cone-shaped with nozzle axis raw oil spout at an angle; Make raw oil when getting into mixing section, be divided into the thin jet of multiply, make raw oil when spraying into mixing section, obtain first step atomizing because the pressure at raw oil spout place falls suddenly; The primary steam spout that is communicated with said primary steam inlet is communicated with described mixing section, and primary steam is sprayed into mixing section; The primary steam that is sprayed in the mixing section by the primary steam spout carries out the impact first time, fragmentation to the raw oil in the mixing section, makes raw oil obtain second stage atomizing; In raw oil injection after the second stage atomizing to the interior pipe, in interior pipe, by primary steam to raw oil further impact, fragmentation, make raw oil obtain third stage atomizing; Cavity setting in the secondary steam spray orifice I correspondence between pipe expansion section exit end and the jet exit; Make a part of secondary steam with above-mentioned flow to via interior pipe between pipe expansion section exit end and the jet exit raw oil in the cavity mix; To its further atomizing, i.e. fourth stage atomizing; Position, secondary steam spray orifice II corresponding nozzle outlet inwall upper end is provided with; Make a part of secondary steam be injected into outlet inwall upper end position through secondary steam spray orifice II; Together enter into riser reactor with secondary steam, primary steam and the raw oil of rest part by jet exit; Steam through secondary steam spray orifice II forms the steam curtain screen between riser reactor inwall and raw oil jet, prevent raw oil coking on the 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 a plurality of along circle distribution; 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 raw oil circumference that spout constitutes.
Described primary steam spout is a plurality of; One of them steam nozzle is positioned at the home position of a plurality of raw oil circumference that spout constitutes; Other primary steam spout is positioned at the outside of raw 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 raw oil spouts.
The angle β of the axis of said raw oil spout and interior tube's axis is 0 ゜～30 ゜.
Secondary steam spray orifice I in being arranged between pipe expansion section exit end and the jet exit has three types, and the angle between three types of described secondary steam spray orifice I and the interior tube's axis is respectively 6 ゜～15 ゜, 15 ゜～40 ゜, 45 ゜～80 ゜.
Angle between secondary steam spray orifice II and the interior tube's 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 said raw oil spout is circle or rectangle.
The angle β of the axis of said raw oil spout and interior tube's axis is 0 ゜～30 ゜.
Angle between described a plurality of secondary steam spray orifice I and the interior tube's axis is respectively 6 ゜～15 ゜, 15 ゜～40 ゜, 45 ゜～80 ゜.
With the spray orifice that interior tube's axis angle Φ 2 is 6 ゜～15 ゜, effect is to make secondary steam be injected in material oil outlet medullary ray two ends, to destroy the oil film that raw oil forms in this position.
With the spray orifice that interior tube's axis angle Φ 1 is 15 ゜～40 ゜, effect is that secondary steam is injected on the shower nozzle inwall, to destroy the oil film that raw oil forms in this position.
With the spray orifice that interior tube's axis angle Φ 3 is 45 ゜～80 ゜, effect is that secondary steam is injected between interior pipe expansion section exit end and the jet exit, and the raw oil through mixing section atomizing and the atomizing of interior pipe is impacted atomizing once more.
Pile up at nozzle exit area for the raw oil after preventing to spray, the outside of said jet exit has the arcual acute angle edge of a knife.
To keep optimum velocity in order making from the raw oil of jet exit ejection, to prevent that the raw oil that sprays into riser tube from producing backflow because of 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 nozzle shower nozzle bottom, the bottom of said shower nozzle is an inclined-plane, and the angle σ between this inclined-plane and the interior tube's axis is 20 ゜～40 ゜.
The form that described primary steam spout and raw oil spout can adopt override formats or directly hole.
The RFCC 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 that is had is following:
1, strengthened atomizing effect: at mixing section; Adopt the form of a plurality of raw oil spouts that raw oil is divided into multiply; Can raw oil " successfully " be carried secretly to interior pipe on the one hand, can realize pressure atomization because of pressure falls suddenly when raw oil is at a high speed through the raw oil spout simultaneously; The atomizing of the formation first step; And raw oil is divided into multiply, and make its atomizing in mixing section more easy, form the second stage " differential atomizing "; Optimized the angle in secondary steam hole, effectively destroyed the oil film of shower nozzle inwall and piled up, eliminated big drop, thereby reach the atomizing particle size of catalytic cracking process requirement,
2, secondary steam spray orifice II on a plurality of distribution upper semicircumferences is set; Use so that secondary steam is injected in to the camber line place of jet exit inwall upper end; And then together spray into to riser reactor on raw oil top and raw oil; Thereby more effectively form the steam curtain screen, suppress the raw oil injection and reflux, prevent the coking of raw oil on the riser reactor wall.
Description of drawings
Fig. 1 is the one-piece construction sectional view of the embodiment of the invention 1.
Fig. 2 is an A-A sectional view among 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 invention 2.
Fig. 5 is an A-A sectional view among 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 invention 3.
Fig. 9 is an A-A sectional view among 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.
Among the 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, interior pipe, 6, expansion section, 7, the aditus laryngis section, 8, contraction section, 9, the secondary steam inlet; 10, mixing section, 11, the primary steam spout, 12, the raw oil spout, 13, the collecting tubule chamber, 14, the raw oil inlet; 15, primary steam inlet, 16, primary steam distributing chamber, 17, the inclined-plane, 18, the acute angle edge of a knife, 19, jet exit.
Embodiment
In conjunction with accompanying drawing and specific embodiment the present invention is explained;
Like Fig. 1, Fig. 2, Fig. 3 and combine Fig. 7, pipe 5, outer tube 3, shower nozzle 1, raw oil inlet 14 and primary steam inlet 15 in a kind of RFCC anti-coking nozzle of multistage atomizing, described nozzle include; In annular cavity looping secondary steam chamber 4 between pipe 5 and the outer tube 6, and in its side secondary steam is set and enters the mouth 9 away from spout; Pipe 5 has contraction section 8, aditus laryngis section 7 and expansion section 6 in described, and the front end of shower nozzle has jet exit 19; Described raw oil inlet 14 is communicated with on collecting tubule chamber 13; And through a plurality of that be uniformly distributed with, be communicated with the mixing section 10 of truncated cone-shaped with nozzle axis raw oil spout 12 at an angle; Make raw oil when getting into mixing section, be divided into the thin jet of multiply, make raw oil when spraying into mixing section, obtain first step atomizing because the pressure at raw oil spout 12 places falls suddenly; The primary steam spout 11 that is communicated with said primary steam inlet 15 is communicated with described mixing section 10, and primary steam is sprayed into mixing section; Among this embodiment, described primary steam spout 11 by be positioned at a plurality of raw oil spouts 12 of the formation circumference center of circle; Primary steam spout 11 is parallel with nozzle axis; The primary steam that is sprayed in the mixing section by primary steam spout 11 carries out the impact first time, fragmentation to the raw oil in the mixing section, makes raw oil obtain second stage atomizing; In raw oil injection after the second stage atomizing to the interior pipe 5, in interior pipe, by primary steam to raw oil further impact, fragmentation, make raw oil obtain third stage atomizing; Cavity setting in the secondary steam spray orifice I 2-2 correspondence between pipe expansion section 6 exit end and the jet exit 19; Make a part of secondary steam with above-mentioned flow to via interior pipe 5 between pipe expansion section 6 exit end and the jet exit 19 raw oil in the cavity mix; To its further atomizing, i.e. fourth stage atomizing; Secondary steam spray orifice II 2-1 corresponding nozzle exports position, 19 inwalls upper end and is provided with; Make a part of secondary steam be injected into outlet inwall upper end position through secondary steam spray orifice II 2-1; Together enter into riser reactor with secondary steam, primary steam and the raw oil of rest part by jet exit 19; Steam through secondary steam spray orifice II 2-1 forms the steam curtain screen between riser reactor inwall and raw oil jet, prevent raw oil coking on the riser reactor wall.
The form that described primary steam spout and raw oil spout can adopt override formats or directly hole.
Working process of the present invention is: after the raw oil of heating gets into nozzle by raw oil inlet 14; At first enter into the collecting tubule chamber 13 of nozzle, again via be arranged on around the primary steam spout 11, with the axis of primary steam spout 11 (be nozzle axis or interior tube's axis at an angle the raw oil spout 12 of β spray into 10 ° of mixing sections; Raw oil spout 12 is 0 °～30 ° with the angle β angle of nozzle axis, and this embodiment is 20 °; The raw oil spout 12 that is arranged on mixing section 10 entrance ends is a plurality of and is uniformly distributed along the circumference that this embodiment is 8; Being shaped as of the raw 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 raw 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 raw oil, and raw oil " successfully " is carried secretly to interior pipe 5; On the other hand, at the entrance end of mixing section 10, raw oil is divided into the thin jet of multiply by raw oil spout 12, and when passing through raw oil spout 12 with high speed, pressure falls suddenly, and volumetric expansion forms first step atomizing.Primary steam carries out the impact first time, broken, formation second stage atomizing to raw oil in mixing section 10 simultaneously, because raw oil is divided into multiply by the raw oil spout, so each raw oil thigh is easy to carried secretly injection; Also realize its atomization process easily.
In interior pipe 5, primary steam carries out further fragmentation, atomizing to raw oil, forms third stage atomizing.In pipe 5 form by contraction section 8, aditus laryngis section 7 and expansion section 6 three parts; At contraction section 8, velocity of steam increases, and raw oil is continued fragmentation; After the transition through aditus laryngis section 7, at expansion section 6, the mobile of central zone raw oil and steam tends towards stability, and the oil film at limit wall place is extended thinlyyer.Cavity in oil droplet and primary steam together enter between pipe expansion section 6 exit end and the 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 °.
Like Fig. 1, Fig. 3; And combine Figure 12, Figure 13, Figure 14, Figure 15, Figure 16; Secondary steam is introduced by secondary steam inlet 9, via the annular steam chamber 4 between interior pipe 5 and the outer tube 3, in the cavity in being injected to through the secondary steam spray orifice again between pipe expansion section 6 exit end and the jet exit 19.
From function, secondary steam is divided into two portions, a part of secondary steam with above-mentioned flow to via interior pipe 5 between pipe expansion section 6 exit end and the jet exit 19 raw oil in the cavity mix, to its further atomizing; 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 by a plurality of secondary steam spray orifice II 2-1 ejections that only are arranged on upper semicircumference; Together enter into riser reactor with secondary steam, primary steam and the raw oil of rest part by jet exit 19; Steam through secondary steam spray orifice II 2-1 forms the steam curtain screen between riser reactor inwall and raw oil jet, prevent raw oil coking on the riser reactor wall.Particularly, secondary steam spray orifice I 2-2 is a plurality of and along circle distribution, the angle between described a plurality of secondary steam spray orifice I 2-2 and the interior tube's axis is respectively 6 °～15 °, and 15 °～40 °, 45 °～80 °.
Shown in figure 13, with interior tube's 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, to destroy the oil film that raw oil forms in this position.
Shown in figure 12, with interior tube's 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 the shower nozzle inwall, to destroy the oil film that raw oil forms in this position.
Shown in figure 14; With interior tube's 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 interior pipe expansion section exit end and the jet exit, and the raw oil through mixing section atomizing and the atomizing of interior pipe is impacted atomizing once more.
Shown in figure 15, and combine Figure 16, with interior tube's axis angle Φ 4 be that a plurality of secondary steam spray orifice II 2-1 of 10 °～55 ° only are arranged on upper semicircumference; Among this embodiment, as indicating among 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 that secondary steam is injected in to the camber line place (the D place of Fig. 3) of jet exit inwall upper end; And then together spray into to riser reactor on raw oil top and raw oil; More effectively suppress the injection backflow thereby form, prevent the coking of raw oil on the riser reactor wall.
Like Fig. 1, Fig. 3, and combine Fig. 7, shower nozzle 1 is a spherical form; It is arranged on the outer tube front end and connects as one with it, and the shower nozzle front portion has the jet exit 19 and the edge of a knife 18, and circular angle is adopted on four limits of jet exit; The spread angle ɑ of jet exit 60 °, this embodiment is 20 °; For the raw oil after preventing to spray is piled up at nozzle exit area, < 90 °, this embodiment is 40 ° to the angle of the acute angle edge of a knife 18 and nozzle axis.
An inclined-plane 17 is set in the bottom of shower nozzle 1, and the angle σ between this inclined-plane and the interior tube's axis is 20 °～40 °, and this embodiment is 30 °.Can make the inclined-plane of shower nozzle bottom concordant like this, thereby weaken of the impact of riser reactor catalyst particles the shower nozzle bottom with the riser reactor inwall.
Like Fig. 4, Fig. 5, Fig. 6 and combine Fig. 7, the major scheme of this embodiment is with embodiment 1, and the primary steam spout is adopted 11 and used override formats among this embodiment; And raw oil spout 12 adopts the directly form of boring; Present embodiment is applicable to the situation of raw oil flow less than 5t/h; This moment, the nozzle overall dimension was less, and is big in mixing section 10 entrance ends welding adapter difficulty, but the thickness of mixing-chamber inlet stomidium plate is not less than 10mm at this moment.
Like Fig. 8, Fig. 9, Figure 10 and combine Figure 11; The major scheme of this embodiment is with embodiment 1, and the difference of this embodiment and embodiment 1 and embodiment 2 is the form of primary steam spout 11 and raw oil spout 12 in mixing section 10 parts among this embodiment, and primary steam is then introduced by primary steam inlet 15; At first get into primary steam distributing chamber 16; Get into mixing section 10 via primary steam spout 11 again, the primary steam spout 11 that is arranged on mixing section 10 entrance ends is one or more, and this embodiment is 9 (shown in one heart two annulus among Fig. 9); Primary steam spout 11 is parallel with nozzle axis, and adopts override formats.
After the raw oil of heating gets into nozzle by raw oil inlet 14, at first enter into the collecting tubule chamber 13 of nozzle, get into mixing section 10 via a plurality of raw oil spouts parallel 12 again with the primary steam spout; The raw oil spout 12 that is arranged on mixing section 10 entrance ends is a plurality of and is uniformly distributed along the circumference that this embodiment is 4, (shown in single annulus among Fig. 9).Raw 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, raw oil is divided into multiply " carefully " jet by raw oil spout 12, and when passing through raw oil spout 12 with high speed, pressure falls suddenly, and volumetric expansion forms first step atomizing; Primary steam is divided into multiply by primary steam spout 11; Like this, the surface-area of unit volume steam increases, can with raw oil more " successfully " carry secretly to interior pipe 5; And because primary steam also is divided into multiply, the initial contact area of steam and raw oil increases, and has strengthened the effect of second stage atomizing in the mixing section.
In addition; In primary steam distributing chamber 16; Primary steam can conduct heat (usually in RFCC through tube wall raw oil in the primary steam distributing chamber 16 outside tube wall of primary steam jet pipe; Vapor temperature is higher than the raw oil temperature), raw oil viscosity is reduced, help its atomizing that is broken.
Claims (7)
1. the RFCC anti-coking nozzle of a multistage atomizing, described nozzle include interior pipe (5), outer tube (3), shower nozzle (1), raw oil inlet (14) and primary steam enter the mouth (15); Annular cavity looping secondary steam chamber (4) between interior pipe (5) and the outer tube (6) also is provided with secondary steam inlet (9); Pipe (5) has contraction section (8), aditus laryngis section (7) and expansion section (6) in described, and the front end of shower nozzle has jet exit (19); It is characterized in that: described raw oil inlet (14) is communicated with on collecting tubule chamber (13); And through a plurality of that be uniformly distributed with, be communicated with the mixing section (10) of truncated cone-shaped with nozzle axis raw oil spout (12) at an angle; Make raw oil when getting into mixing section, be divided into the thin jet of multiply, make raw oil when spraying into mixing section, obtain first step atomizing because the pressure that raw oil spout (12) is located falls suddenly; The primary steam spout (11) that is communicated with said primary steam inlet (15) is communicated with described mixing section (10), and primary steam is sprayed into mixing section; The primary steam that is sprayed in the mixing section by primary steam spout (11) carries out the impact first time, fragmentation to the raw oil in the mixing section, makes raw oil obtain second stage atomizing; In raw oil injection after the second stage atomizing to the interior pipe (5), in interior pipe, by primary steam to raw oil further impact, fragmentation, make raw oil obtain third stage atomizing; Cavity setting in secondary steam spray orifice I (2-2) is corresponding between pipe expansion section (6) exit end and the jet exit (19); Make a part of secondary steam with above-mentioned flow to via interior pipe (5) between pipe expansion section (6) exit end and the jet exit (19) raw oil in the cavity mix; To its further atomizing, i.e. fourth stage atomizing; Position, secondary steam spray orifice II (2-1) corresponding nozzle outlet (19) inwall upper end is provided with; Make a part of secondary steam be injected into outlet inwall upper end position through secondary steam spray orifice II (2-1); Together enter into riser reactor with secondary steam, primary steam and the raw oil of rest part by jet exit (19); Steam through secondary steam spray orifice II (2-1) forms the steam curtain screen between riser reactor inwall and raw oil jet, prevent raw oil coking on the riser reactor wall.
2. the RFCC anti-coking nozzle of a kind of multistage atomizing according to claim 1; It is characterized in that: described secondary steam spray orifice comprises secondary steam spray orifice I (2-2) and secondary steam spray orifice II (2-1), and wherein secondary steam spray orifice I (2-2) is a plurality of along circle distribution; 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).
3. the RFCC anti-coking nozzle of a kind of multistage atomizing according to claim 1, it is characterized in that: described primary steam spout (11) is one, is positioned at the home position that a plurality of raw oil spouts (12) constitute circumference.
4. the RFCC 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 raw oil circumference that spout constitutes; Other primary steam spout is positioned at the outside of raw 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 raw oil spouts.
5. the RFCC anti-coking nozzle of a kind of multistage atomizing according to claim 1, it is characterized in that: the angle β of the axis of said raw oil spout and interior tube's axis is 0 ゜～30 ゜.
6. the RFCC 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) in being arranged between pipe expansion section (6) exit end and the jet exit has three types; Angle between three types of described secondary steam spray orifice I (2-2) and interior pipe (5) axis is respectively 6 ゜～15 ゜; 15 ゜～40 ゜, 45 ゜～80 ゜.
7. the RFCC anti-coking nozzle of a kind of multistage atomizing according to claim 1, it is characterized in that: the angle between secondary steam spray orifice II (2-1) and interior pipe (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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105368479A (en) * | 2015-10-16 | 2016-03-02 | 中国石油大学(北京) | Novel flow aid technology promoting mixing of raw oil and catalyst in catalytic cracking riser feeding area |
| CN105778978A (en) * | 2016-04-15 | 2016-07-20 | 洛阳森德石化工程有限公司 | Use method of multi-stage raw oil atomizing spray nozzle structure for heavy oil catalytic cracking |
| CN106010630A (en) * | 2016-06-27 | 2016-10-12 | 石宝珍 | Feed atomizing nozzle for catalytic cracking |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105368479A (en) * | 2015-10-16 | 2016-03-02 | 中国石油大学(北京) | Novel flow aid technology promoting mixing of raw oil and catalyst in catalytic cracking riser feeding area |
| 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 |
| CN105778978A (en) * | 2016-04-15 | 2016-07-20 | 洛阳森德石化工程有限公司 | Use method of multi-stage raw oil atomizing spray nozzle structure for heavy oil catalytic cracking |
| 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 |
| CN106010630A (en) * | 2016-06-27 | 2016-10-12 | 石宝珍 | Feed atomizing nozzle for catalytic cracking |
| 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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