CN104774641B - A kind of catalytic cracking riser feed jet mixing section structure for promoting feedstock oil efficiently to be mixed with catalyst - Google Patents
A kind of catalytic cracking riser feed jet mixing section structure for promoting feedstock oil efficiently to be mixed with catalyst Download PDFInfo
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- CN104774641B CN104774641B CN201410014516.1A CN201410014516A CN104774641B CN 104774641 B CN104774641 B CN 104774641B CN 201410014516 A CN201410014516 A CN 201410014516A CN 104774641 B CN104774641 B CN 104774641B
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Abstract
The invention belongs to technical field of petrochemical industry, it is related to the riser reactor feed jet mixing section structure for promoting feedstock oil efficiently to be mixed with catalyst in a kind of catalytic cracking process.Raw material oil atomization spray nozzle uses the mounting means axially fed obliquely along riser, so that oil, agent counter current contacting in catalytic cracking riser feed jet mixing section.Raw material oil atomization spray nozzle installation set pipe (1) is arranged on riser reactor tube wall (2) obliquely vertically, and raw material oil atomization spray nozzle is arranged in raw material oil atomization spray nozzle installation set pipe (1).In feed jet mixing section structure of the present invention, the raw material oil droplet sprayed into by raw material oil atomization spray nozzle is contacted with catalyst granules adverse current, it is in cross-counterflow mixed flow to make the state between material jet and catalyst, improves oil, the contact of agent and troubled water in catalytic cracking riser feed jet mixing section；And transitted to " piston flow " by " complete mixing flow " rapidly after the two mixing, reduce the space of mixed process, shorten the time of mixed process, improve reaction efficiency.
Description
Technical field
The invention belongs to technical field of petrochemical industry, it is related in a kind of catalytic cracking process and promotes feedstock oil high with catalyst
Imitate the riser reactor feed jet mixing section structure of mixing.
Background technology
Catalytic cracking process occupy in China's oil processing industry very important status there is provided China market 70% with
On gasoline and about 30% diesel oil.Riser reactor is one of core apparatus of catalytic cracking.The purpose product of high value
Gasoline, diesel oil and liquefied gas etc. are obtained in it.
According to the role during cracking reaction, generally whole riser reactor can be from the bottom to top divided into pre-
Raising section, feed jet mixing section, abundant conversion zone and outlet four, area of quick separating part, in pre lift zone, pre-lift vapour
(gas) from lifting bottom of the tube enter, with regenerator sloped tube introduce substantial amounts of catalyst granules mixing, contact, and carry catalyst to
Upper motion.When reaching feed jet mixing section, the feedstock oil that catalyst granules is sprayed into the atomizer set obliquely is mixed, connect
Touch and start reaction rapidly, the target product such as generation gasoline, diesel oil, liquefied gas；The setting angle of nozzle in existing commercial plant
It is in 30 °~40 ° with lifting tube wall, feedstock oil injecting lift pipe reactor obliquely.In abundant conversion zone, oil, agent composition
Move upwards while proceeding cracking reaction on one side.When reaching riser end outlet quick separating area, in quick separating
In the presence of system, reaction product --- such as diesel oil, gasoline and catalyst is separated rapidly, to prevent occurring overcracking.
In feed jet mixing section, although the time of contact between feedstock oil and the catalyst of high activity only has 0.2~0.3S,
But completed in Dan Gai areas 50~60% cracking reaction, therefore contact between the feedstock oil and catalyst in the area is with mixing
Situation will directly influence the process of whole cracking reaction.
For finish two-phase in feed jet mixing section flowing with mixing, ideal situation includes the meaning of two aspects
Justice：
1. the first stage, require that realization is quick, uniform between oil, agent, fully contacts, mix, i.e., in riser first
In reactor, the Quick-gasifying and high selectivity for forming " complete mixing flow " to ensure raw material oil mist particle are converted；Connecing between oil, agent
Touch, incorporation time should shorten as far as possible, and oil, agent should be avoided to occur axially " reciprocal back-mixing " and contact repeatedly, and oil phase and agent phase
Concentration distribution mutually " matching " --- the high region of oil phase concentration, catalyst concn is also higher, and vice versa；
2. second stage, after the contact mixing between oil, agent, gasification terminate, oil agent mixture should be with " horizontal sliding
The form of stream " is moved upwardly together；I.e. oil, agent composition should be changed into " laminar flow " rapidly by " complete mixing flow " of first stage.
However, in the case where current raw material oil spray nozzle is set obliquely, actual conditions but greatly differ from each other with ideal state,
Subject matter is also embodied in two aspects：
(1) because nozzle is set obliquely, in riser charging mixing, in " intersection-is simultaneously flowed between oil, agent two-phase
The state of upper flowing ", the speed difference between oil, agent is relatively low.And the fluid of two bursts of cocurrents occurs momentum, quality, heat exchange and entered
And " intensity " mixed depends on the speed difference of the two.Therefore it is difficult to form real " complete mixing flow " in feed jet mixing section, entirely
Mixed process is all longer over time and space, it is impossible to realize rapid mistake of the above-mentioned first stage " complete mixing flow " to " laminar flow "
Cross.
In addition, research show, in the case where nozzle is set obliquely, when material jet obliquely enter riser it
Afterwards, one " Secondary Flow " will be formed between jet and lifting inside pipe wall, therefore in the subregion of feed jet mixing section, finish
The contact of two-phase, troubled water are unsatisfactory, are mainly manifested in：Finish two-phase lifting tube section on concentration distribution not "
With ", the region of oil phase concentration of a relatively high (low), agent phase concentration is diluter (height).
(2) due to there is the presence of " Secondary Flow ", in some regions of riser reactor feed jet mixing section, catalyst is deposited
In more serious air-teturning mixed phenomenon, especially near riser side wall, catalyst back-mixing is more violent, and this causes catalyst to stop
Time lengthening is stayed, the probability contacted repeatedly between oil, agent is also increased, causes more serious coking.It is reported that coking is the most
Serious region is located above nozzle near 500mm~2000mm lifting inside pipe wall.
For many years, for the deficiency in terms of the above-mentioned two that exists in riser feed jet mixing section, domestic and international many scientific researches
Institutes, oil company propose a variety of riser feed jet mixing section structures, to realize preferable oil, agent mixed process.
Sinopec Research Institute of Petro-Chemical Engineering proposes a kind of anti-back-mixing riser, and main feature has two：Feedstock oil
Riser is tangentially entered using axle；Feed zone uses undergauge structure.This structure effectively improves so-called " ring-core knot
Structure ", improves catalyst granules situation pockety on lifting tube section, and inhibit catalyst granules in side wall area
The back-mixing in domain, still, this structure is due to using axle tangential admission, according to the characteristics of eddy flow, feedstock oil stopping in riser
Time lengthening is stayed, is also unfavorable for reaction which increases the probability contacted repeatedly between oil, agent.
Uop Inc. of the U.S. (US5348644, US6511635B2) is it has been suggested that in the upper of riser inner nozzle installation site
Trip sets diversion component, it is desirable to be able to improve the initial contact situation between oil, agent.But, found by our experiment, by
In the injection of feedstock oil, strong influence will be produced to the region of riser inner nozzle upstream, thus the effect of this structure should
When being very limited amount of.
China University Of Petroleum Beijing and Luoyang Sende Petrochemical Engineering Co., Ltd. it is also proposed two kinds of feed segment structures
(ZL201020623008, ZL201020622990), i.e., set the inner member of " streamlined " above nozzle, and introduces auxiliary gas
The form of body.Its main function is control and utilizes above-mentioned " Secondary Flow ", so that promotion secondary flow, region oil, agent mixing are played,
Reduce " the reciprocal back-mixing " of the region catalyst granules and feedstock oil.But these improvement still have weak point, interior structure
The introducing of part, attachment point is provided for coke build-up in feed zone.Importantly, in the case where nozzle is set obliquely,
Flow regime between material jet and catalyst is " intersect-cocurrent upward ", and speed difference is relatively small between oil, agent, therefore
" intensity " that the two produces momentum, quality, heat exchange and then mixing is relatively low.And the fed version that sets obliquely of nozzle is from root
Be difficult in sheet suppress Secondary Flow generation, even there is provided inner member and auxiliary gas, the also only improvement of local sense,
It is difficult to be formed really " complete mixing flow " in " first stage " of feed jet mixing section, it is also difficult to after mixing terminates, by the first rank
" complete mixing flow " of section transits to rapidly " laminar flow " of " second stage ".
The content of the invention
In existing riser reactor commercial plant, raw material oil atomization spray nozzle is to tilt to set axially upwards along riser
Put, i.e. the angle of nozzle and riser reactor tube wall is 30 ° obliquely~40 °, feedstock oil injecting lift tube reaction obliquely
Device.The present invention proposes a kind of catalytic cracking riser feed jet mixing section structure for promoting feedstock oil efficiently to be mixed with catalyst.Should
It is in structure, the mounting means of raw material oil atomization spray nozzle is axially oblique along riser to be changed to by the setting obliquely of traditional form
Lower to set, i.e., the raw material oil droplet sprayed into raw material oil atomization spray nozzle is changed to enter lifting obliquely by spraying into riser obliquely
Pipe, makes feedstock oil in riser feed jet mixing section be contacted with catalyst granules adverse current, the state between material jet and catalyst
In " intersection-adverse current " mixed flow, increase oil, speed difference between agent, strengthen the two momentum, quality, heat exchange, and then
Add the oil in the area, agent and mix " intensity ".
In addition, in traditional form riser feed jet mixing section structure, " Secondary Flow " causes in the part of feed jet mixing section
In region, the contact of finish two-phase, troubled water are unsatisfactory, finish two-phase lifting tube section on concentration distribution not "
With ", and catalyst back-mixing acutely, increases the probability contacted repeatedly between oil, agent, causes more tight near riser side wall
The coking of weight.And from the point of view of the mechanism that " Secondary Flow " is produced, oblique upper feeding then in feed jet mixing section oil, agent two-phase for " intersect-
Cocurrent " mixed flow, if the two fluids of concurrent flow has speed difference and transverse velocity gradient, inherently produces one similar
In aerodynamics Ku Ta-eat can Paderewski lift cross force, the cross force points to wall, then necessarily leads to " secondary
Stream ".And the present invention proposes the feed segment structure that nozzle is set obliquely, feedstock oil enters riser obliquely, in riser
Oil, agent counter current contacting, mixing, storehouse tower such as can Paderewski lift point to main flow direction, then will not produce " Secondary Flow ", therefore can be big
Amplitude improves catalyst granules skewness in traditional form feed jet mixing section, oil concentration mismatch, riser side wall and urged
The violent situation of agent back-mixing.
And by the way of injection stream and catalyst counter current contacting, the two mixes " intensity " in riser feed zone
Increase, can reduce the space of mixed process, shorten the time of mixed process, realize the above-mentioned first stage " complete mixing flow " to " horizontal sliding
The rapid transition of stream ".
The technical solution used in the present invention is：
A kind of catalytic cracking riser feed jet mixing section structure for promoting feedstock oil to be mixed with catalyst, in riser charging
Duan Zhong, oil, agent counter current contacting strengthen mixed effect.On the tube wall of riser feed jet mixing section, raw material oil atomization spray nozzle is set
Installation sleeve pipe, nozzle install sleeve pipe in be provided with raw material oil atomization spray nozzle, the installation sleeve pipe is connected with riser, its side
To axially downwardly to be tilted along riser, the angle of the axis of the installation sleeve pipe and lifting tube wall below is 10 ° obliquely
~70 °, its arrangement is is arranged circumferentially along riser, and quantity is 2~10.Feedstock oil is installed in the installation sleeve pipe
Atomizer, feedstock oil is injected in riser obliquely after being atomized through atomizer, the catalyst carried with pre-lift steam
Counter current contacting, mixing are flowed, is formed " complete mixing flow ", and proceed by cracking reaction；After mixed process terminates, oil, agent two-phase mixtures
Thing is changed into rapidly " laminar flow ", and is moved upwards along riser jointly.
The present invention is as a result of technical scheme as described above, it will produce following beneficial effect：
1st, the raw material oil droplet sprayed into riser feed zone by raw material oil atomization spray nozzle is contacted with catalyst granules adverse current,
The two is in " intersection-adverse current " mixed flow, increases speed difference between oily, agent, strengthen the two momentum, quality, heat exchange,
And then increase " intensity " of the two mixing, shorten mixed process in time, this will make the raw material of the atomization that is sprayed by nozzle
Oil drops rapid vaporization, improves conversion ratio.
2nd, jet expansion jet is bright to the influence area of oily, agent two-phase flow in feed nozzle above riser in the structure
Aobvious to reduce, compared with conventional lift pipe feed segment structure, injection stream zone of influence height can shorten about 50%, spatially shorten
Mixed process, it is suppressed that oil, agent " reciprocal back-mixing ", reduces coking.
3rd, in riser feed zone, the distribution of feedstock oil and catalyst concn along lifting tube section is all more uniform, this
It is beneficial to realize between feedstock oil jet and catalyst granules and quickly, uniformly, fully contacts, mixes, improves target product
Yield.
Brief description of the drawings
Fig. 1 is the schematic diagram of catalytic cracking riser feed jet mixing section structure of the present invention；
Fig. 2 is Fig. 1 A-A direction views；
Fig. 3 is the schematic diagram of another form of catalytic cracking riser feed jet mixing section structure of the invention；
Fig. 4 is Fig. 3 A-A direction views；
In figure：1st, raw material oil atomization spray nozzle installation set pipe, 2, riser reactor tube wall
Embodiment
With reference to accompanying drawing, the present invention is further described with embodiment：
Embodiment 1
As shown in Figure 1 and Figure 2, a kind of catalytic cracking riser feed jet mixing section knot for promoting feedstock oil to be mixed with catalyst
Structure.In riser feed jet mixing section, catalyst is flowed from the bottom to top by bottom, and feedstock oil is then via installed in raw material oil atomization
The nozzle that nozzle installs sleeve pipe 1 is injected in riser feed jet mixing section obliquely.Oil, agent counter current contacting, and then form " friendship
Fork-adverse current " mixed flow, can strengthen mixed effect.
On the tube wall 2 of riser feed jet mixing section, the installation sleeve pipe 1 of raw material oil atomization spray nozzle is set, installed in nozzle
Raw material oil atomization spray nozzle is set in sleeve pipe 1, and the installation sleeve pipe 1 is connected with riser, the axis of sleeve pipe 1 is installed with carrying below
The angle α of riser tube wall 2 is for 30 ° obliquely in obliquely 10 °~70 °, the embodiment；Its arrangement is along riser week
To being evenly arranged, it in 2~10, the embodiment is 4 that quantity, which is,.The outlet linear speed of nozzle is 30~80m/s, the embodiment
For 40m/s, bottom pre-lift linear speed is 1.0~3.5m/s, and the embodiment is 1.0m/s.
During present invention work, feedstock oil is injected in riser after being atomized through atomizer, is carried with pre-lift steam
Catalyst stream counter current contacting, mixing, are formed " complete mixing flow ", and proceed by cracking reaction；After mixed process terminates, oil, agent two
Phase mixture is changed into rapidly " laminar flow ", is moved upwards along riser jointly.
Embodiment 2
As shown in Figure 3, Figure 4, a kind of catalytic cracking riser feed jet mixing section knot for promoting feedstock oil to be mixed with catalyst
Structure.In riser feed jet mixing section, catalyst is flowed from the bottom to top by bottom.Feedstock oil sprays via installed in raw material oil atomization
The nozzle that mouth installs sleeve pipe 1 is injected in riser feed jet mixing section obliquely.The lower section riser that nozzle installs sleeve pipe 1 is present
Reducing, lifts tube section and increased, angle of flare γ is 2 °~30 °, be 10 ° in the embodiment from the bottom to top.Enter in riser
Expect oil, agent counter current contacting in section, and then form " intersection-adverse current " mixed flow, mixed effect can be strengthened.
On the tube wall 2 of riser feed jet mixing section, the installation sleeve pipe 1 of raw material oil atomization spray nozzle is set, installed in nozzle
Raw material oil atomization spray nozzle is set in sleeve pipe 1, and the installation sleeve pipe 1 is connected with riser.The axis of sleeve pipe 1 is installed with carrying below
The angle α of tube wall 2 is that the angle of the two is 38 ° obliquely in obliquely 10 °~70 °, the embodiment at riser reducing；Installation set
The arrangement of pipe 1 is is arranged circumferentially along riser, and it in 2~10, the embodiment is 4 that quantity, which is,.The outlet of nozzle
Linear speed is 30~80m/s, the embodiment is 50m/s, and bottom pre-lift linear speed is 1.0~3.5m/s, and the embodiment is 2.5m/
s.During present invention work, nozzle is arranged on the top at riser reducing, and feedstock oil is injected to lifting after being atomized through atomizer
Guan Zhong, the catalyst that pre-lift steam is carried is via feed jet mixing section is entered at reducing, oil, agent counter current contacting, mixing are formed
" complete mixing flow ", and proceed by cracking reaction；After mixed process terminates, oil, agent two-phase mixture are changed into rapidly " laminar flow ",
Moved upwards along riser jointly.
Claims (3)
1. a kind of catalytic cracking riser feed jet mixing section structure for promoting feedstock oil efficiently to be mixed with catalyst, enters in riser
On the tube wall for expecting mixing section, raw material oil atomization spray nozzle installation set pipe (1) is set, is installed in nozzle in sleeve pipe and is provided with raw material mist of oil
Change nozzle；It is characterized in：Described installation sleeve pipe (1) is connected with riser, and its direction is pacified axially downwardly to be tilted along riser
The angle α of the axis of tubing (1) and lifting tube wall (2) below is 10 °~70 ° obliquely, and nozzle installs sleeve pipe (1)
It is γ that lower section riser, which need to have at reducing, reducing the angle of flare from the bottom to top, and γ scope is 2 °~30 °, and the corresponding scopes of α are
No more than (70 ° of -2 γ).
2. the catalytic cracking riser feed jet mixing section knot according to claim 1 for promoting feedstock oil to be mixed with catalyst
Structure, is arranged circumferentially it is characterized in that installing sleeve pipe (1) along riser, and quantity is 2~10.
3. the catalytic cracking riser feed jet mixing section knot according to claim 1 for promoting feedstock oil to be mixed with catalyst
Structure, it is characterized in that the outlet linear speed of nozzle is 30~80m/s, bottom pre-lift linear speed is 1.0~3.5m/s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410014516.1A CN104774641B (en) | 2014-01-14 | 2014-01-14 | A kind of catalytic cracking riser feed jet mixing section structure for promoting feedstock oil efficiently to be mixed with catalyst |
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| CN201410014516.1A CN104774641B (en) | 2014-01-14 | 2014-01-14 | A kind of catalytic cracking riser feed jet mixing section structure for promoting feedstock oil efficiently to be mixed with catalyst |
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| CN104774641B true CN104774641B (en) | 2017-07-21 |
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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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86104772A (en) * | 1985-07-16 | 1987-02-11 | 法国托塔尔炼油和销售公司 | The method of hydrocarbons fluidised-bed catalytic creaking, device and application |
| US5139748A (en) * | 1990-11-30 | 1992-08-18 | Uop | FCC riser with transverse feed injection |
| CN203890297U (en) * | 2014-01-14 | 2014-10-22 | 中国石油大学(北京) | Catalytic cracking riser feeding section structure promoting mixing of raw oil and catalyst |
-
2014
- 2014-01-14 CN CN201410014516.1A patent/CN104774641B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86104772A (en) * | 1985-07-16 | 1987-02-11 | 法国托塔尔炼油和销售公司 | The method of hydrocarbons fluidised-bed catalytic creaking, device and application |
| US5139748A (en) * | 1990-11-30 | 1992-08-18 | Uop | FCC riser with transverse feed injection |
| CN203890297U (en) * | 2014-01-14 | 2014-10-22 | 中国石油大学(北京) | Catalytic cracking riser feeding section structure promoting mixing of raw oil and catalyst |
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