CN104232148A - Catalytic cracking disengager with two sections of risers for retarding coking - Google Patents
Catalytic cracking disengager with two sections of risers for retarding coking Download PDFInfo
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- CN104232148A CN104232148A CN201410486590.3A CN201410486590A CN104232148A CN 104232148 A CN104232148 A CN 104232148A CN 201410486590 A CN201410486590 A CN 201410486590A CN 104232148 A CN104232148 A CN 104232148A
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Abstract
The invention discloses a catalytic cracking disengager with two sections of risers for retarding coking. The catalytic cracking disengager comprises a disengager casing, wherein a first-section riser rough cyclone separator, a first-section top cyclone separator, a second-section riser rough cyclone separator and a second-section top cyclone separator; an inner steam stripping section and an outer steam stripping section are arranged in the disengager; a dipleg of the second-section riser rough cyclone separator extends into the inner steam stripping section; an air outlet of the first-section riser rough cyclone separator is connected with an air inlet of the first-section top cyclone separator in a socketing mode; a second-section rough cyclone riser of the second-section riser rough cyclone separator is connected with the second-section top cyclone separator. A cover body and the second-section rough cyclone riser are communicated by an air duct; one end of the air duct is arranged at the upper part of the cover body. According to the catalytic cracking disengager, the coking in the disengager can be better retarded or inhibited and the operating cycle of the catalytic cracking device is prolonged.
Description
Technical field
The present invention relates to a kind of heavy oil fluid catalytic cracking anti-coking settling vessel, concrete, relate to a kind of two-stage riser fluid catalytic cracking anti-coking settling vessel of slow down coking.
Background technology
Catalytic cracking (FCC) is most important secondary processing process in petroleum refining industry of China, its objective is and improves the level of crude oil processing and quality product, increases lightweight oil output.Along with the development of catalytic cracking process and catalyst technology, stock oil is extended to residual oil, and stock oil heaviness causes the coking problem in heavy oil catalytically cracking equipment reacting-settler system, gas pipeline, Fractionator Bottom, slurry service in equipment surface to become day by day serious.Equipment wall coking problem has become the major hidden danger affecting the smooth running of heavy oil catalytically cracking equipment long period, if device generation unusual fluctuations (as feed break, the vexed bed of revivifier etc.), in settling vessel, coking block is once come off, blocking catalyst circulation passage, will cause circulation smooth or interrupt, catalyst stack less, until device is forced to parking coke cleaning, tremendous economic is caused to lose to enterprise.
Refinery catalytic cracking device riser reactor outlet is all provided with fast gas-solid separator (slightly revolving), for realizing oil gas and catalyzer sharp separation, stopping cracking reaction, separation efficiency is up to more than 98%, the reacted oil gas of riser tube with catalyzer after too fast subset (slightly revolving) is separated, enter the cyclonic separator (top is revolved) at settling vessel top.Thick Cyclone outlet is connected with top cyclone inlet, most employing opened type, the outlet being about to slightly revolve raises, make it the entrance revolved close to settling vessel top, shorten the residence time of most of oil gas in settling vessel, but this technological process has increased the weight of the coking of the thick cyclonic separator outer wall of settling vessel and riser outer wall sometimes, is unfavorable for the long-term operation of device.On the other hand, thick cyclone dip-leg discharges catalyzer under positive pressure differential condition, discharge 15 ~ 30% oil gas, this part oil gas, by after dipleg, enters settling vessel bed simultaneously, settling vessel top is risen at a slow speed from settling vessel bottom, at 60 ~ 120 seconds, there is the reactions such as obvious excessive heat cracking, condensation in the residence time, not only make dry gas and coke increase under 500 DEG C of high temperature, affect yield of light oil, and easily cause settling vessel coking.
For preventing settling vessel coking, patent CN203525447U transforms existing installation, adopts whirlwind cartridge type quick disconnector, and revolves airtight connection with top; Arrange division board in settling vessel bottom, top spin material leg hypomere arranges Weight type flutter valve.In the program, cyclone cylinder and top are revolved and are airtightly connected to form " negative pressure " separation system, and whole oil gas divides carrying-off soon through cyclone cylinder, fast sub-system oil gas containing rate 100%; Settling vessel arranges steam insulated chamber, does not allow oil gas enter and thoroughly avoids oil gas coking.But " the airtight connection " that adopt in the program makes turndown ratio less, if be particularly applied in two-stage riser fluid catalytic cracking operating process, if there is operation fluctuation, be very easy to cause catalyzer to run agent.
Given this, special proposition the present invention.
Summary of the invention
The object of this invention is to provide a kind of two-stage riser fluid catalytic cracking settling vessel of slow down coking, this device can be good at slowing down or suppress coking in settling vessel, extends catalytic cracking unit operation period.
The technical scheme that the present invention is adopted for achieving the above object is:
A kind of two-stage riser fluid catalytic cracking settling vessel of slow down coking, comprise: settling vessel shell, settling vessel enclosure is provided with one section of thick cyclonic separator of riser tube, one section of top cyclonic separator, two sections of thick cyclonic separators of riser tube, two sections of top cyclonic separators, it is characterized in that, in settling vessel enclosure, be also provided with internal stripping section cover body, cover body and settling vessel shell are positioned at same vertical central axis, the upper end of cover body is closed, and bottom is opening;
Wherein, one section of thick cyclonic separator, one section, the dipleg of the top cyclonic separator of two is all positioned at outside cover body, the dipleg of two sections of thick cyclonic separators stretches in cover body;
The inlet mouth bayonet joint of one section of thick cyclonic separator air outlet and one section of top cyclonic separator;
Be airtight connection between the air outlet of two sections of thick cyclonic separators and the inlet mouth of two sections of top cyclonic separators, and be connected with two sections of riseies slightly revolved by cover body by airway, one end of airway is located at cover body top.
Preferably, the diameter of the air outlet of one section of thick cyclonic separator is less than the diameter of the inlet mouth of one section of top cyclonic separator; More preferably, the ratio of the air outlet area of one section of thick cyclonic separator and the inlet mouth area of one section of top cyclonic separator is 1:1.05 ~ 1:1.2.
Two sections of described thick spin material legs stretch into cover body through the sidewall of cover body, or stretch in cover body from the top of cover body through top board.
It is preferred, and the sidewall that the dipleg of two sections of described thick cyclonic separators exports through cover body is communicated with cover body inside.
Preferred, the dipleg outlet of two sections of described thick cyclonic separators is positioned at the catalyzer dense-phase bed of cover body.The beds that described dense-phase catalyst bed is filled from the space formed to dipleg and faceshield side wall connectivity part bottom cover body for internal stripping section plant running.
One section of leg outlet and two sections of leg outlets can be connected one or more thick cyclonic separator respectively, and each thick cyclonic separator can connect one or more top cyclonic separator.
Preferably, one end of described airway is positioned at the top of cover body, or between the dipleg and top of two sections of thick cyclonic separators position; More preferably, one end of described airway is positioned at the top of cover body.
The outlet of two sections of thick spin material legs can arrange flutter valve, erosion control baffle plate or back taper.
Described airway can be one or more.
Preferably, total cross-sectional area of airway is 0.25 to 0.3 times of cover body cross-sectional area.
In the two-stage riser fluid catalytic cracking settling vessel of slow down coking of the present invention, the position of stripping stage is identical with conventional settling vessel, and described cover body is positioned at the stripping stage center of settling vessel bottom, and extends to bottom stripping stage always.
The inside of described cover body of the present invention is internal stripping section, and the space between the outer wall of cover body and the overall stripping stage inwall of settling vessel is outer stripping stage.
Stripping baffles, stripped vapor sparger is provided with in the inside of cover body.
Stripping stage outside, arranges stripping baffles and stripped vapor sparger around cover body outer wall.
Preferably, described stripping baffles is disk ring type baffle plate, and inner ring baffle plate and outer shroud baffle plate are uniformly distributed along the circumference a circle or multi-turn stripped vapor nozzle.
According to actual needs, stripping baffles arranges multiple along cover body.
Stripped vapor sparger can arrange more than 2 according to catalyst recirculation amount.
The lower end of described cover body and the nethermost stripped vapor sparger of outer stripping stage on same level position, and cover body inside and outside be communicated with.
The two-stage riser fluid catalytic cracking settling vessel of slow down coking of the present invention, also comprises collection chamber in settling vessel enclosure.
Collection chamber is positioned at the topmost of settling vessel, and the outlet of one section, two sections top cyclonic separator is communicated with collection chamber.
Described one section, two sections thick cyclonic separators are connected with the outlet of one section, two sections riser reactor respectively.
Compared with prior art, the advantage that the two-stage riser fluid catalytic cracking settling vessel of slow down coking of the present invention is outstanding is:
(1) the present invention is separated from each other carries out independent stripping by from lifting one section, the catalyzer of two sections in settling vessel, avoids one section, two sections catalyzer to mix in stripping process, improves oil gas desorption efficiency.
Use independently stripped vapor in (2) one sections, two sections catalyst stripping processes, do not interfere with each other, according to catalyst recirculation amount, properly distributed steam flow, improves the turndown ratio of stripping process.
(3) cover body of stripping apparatus of the present invention and internal stripping section is provided with oil gas airway, section catalyst stripping oil gas of two after stripping can be caused collection chamber rapidly, decrease the residence time of oil gas, reduces the secondary reaction of oil gas.
Accompanying drawing explanation
Fig. 1 is the structural representation of the two-stage riser fluid catalytic cracking settling vessel of slow down coking.
001-settling vessel shell; 1-one section of thick cyclonic separator; 101-one section of leg outlet; The riser of 102-one section of thick cyclonic separator; 103-one section of thick spin material leg; The outlet of 1031-one section of thick spin material leg; 2-one section of top cyclonic separator; 201-one section of top spin material leg; The outlet of 2021-one section of top spin material leg; 3-two sections of thick cyclonic separators; 301-two sections of leg outlets; 302-two sections of thick spin material legs; The riser of 303-two sections of thick cyclonic separators; The outlet of 3021-two sections of thick spin material legs; 4-two sections of top cyclonic separators; 401-two sections of top spin material legs; The outlet of 4021-two sections of top spin material legs; 5-internal stripping section; 501-oil gas airway; 502-cover body; Secondary stripped vapor sparger in 503-internal stripping section; One-level steam distributor in 504-internal stripping section; 505-internal stripping section steam baffle; Catalyzer dense-phase bed in 6-internal stripping section; 7-settling vessel reducer; 701-outer stripping stage second steam sparger; 702-outer stripping stage one-level steam distributor; 8-stripping stage; The outlet at bottom of 9-internal stripping section; 10-settling vessel; 11-collection chamber; 12-outer stripping stage
Embodiment
Be described in further detail below in conjunction with the two-stage riser fluid catalytic cracking settling vessel of accompanying drawing to slow down coking of the present invention, do not limit protection scope of the present invention, its protection domain defines with claims.Detail disclosed in some provides complete understanding to each disclosed embodiment.But those skilled in the relevant art know, do not adopt these concrete details one or more, and adopt the situation of other parts, material etc. can realize embodiment yet.
With reference to accompanying drawing 1, a kind of two-stage riser fluid catalytic cracking settling vessel 10 of slow down coking, comprise settling vessel shell 001, settling vessel enclosure is provided with one section of thick cyclonic separator, 1, one section of top cyclonic separator, 2, two sections of thick cyclonic separators, 3, two sections of top cyclonic separators 4; In settling vessel enclosure, be also provided with cover body 502, cover body 502 and settling vessel shell are positioned at same vertical central axis, and the upper end of cover body 502 is closed, and bottom is opening.Cover body 502 is positioned at whole stripping stage center, and the length of cover body 502 is greater than the length of stripping stage 8.The inside of cover body 502 is internal stripping section 5, and the annular space formed between cover body outer wall and settling vessel outer casing inner wall is outer stripping stage 12.The cross section of cover body can various shape, such as, and circle, hexagon, octagon, ellipse etc.
Be respectively equipped with riser (102,303) at the top of one section, two sections thick cyclonic separator, bottom is respectively equipped with dipleg (103,302).
Wherein, the dipleg (201,401) of dipleg 103, one section, the two sections top cyclonic separators (2,4) of one section of thick cyclonic separator 1 is all positioned at outside cover body, and the dipleg 302 of two sections of thick cyclonic separators 3 stretches in cover body.
The air outlet of the riser 102 of one section of thick cyclonic separator 1 and the inlet mouth bayonet joint of one section of top cyclonic separator 2; Be airtight connection between the air outlet of the riser 303 of two sections of thick cyclonic separators 3 and the inlet mouth of two sections of top cyclonic separators 4, and by airway 501, cover body 502 slightly revolved riser 303 be connected with two sections, one end of airway 501 is located at cover body top.
The two-stage riser fluid catalytic cracking settling vessel of slow down coking of the present invention, between the outer wall of internal stripping section cover body 502 and settling vessel reducer 7 inwall and stripping stage 8 inwall, form annular space is outer stripping stage 12.Catalyzer, the catalyzer of one section of top spin material leg 201 discharge and the catalyzer of two sections of top spin material leg 401 discharges that the dipleg 103 of one section of thick cyclonic separator 1 is discharged enter annular space, through steam stripped in the outer stripping stage 12 of annular space, one section of catalyzer after stripping and part two sections of catalyst mix enter inclined tube to be generated.The dipleg 302 of two sections of thick cyclonic separators 3 enters (namely the cover body of internal stripping section is interior) in oil gas stripping apparatus, the outlet of dipleg is positioned at the dense-phase catalyst bed of oil gas stripping apparatus, catalyzer from two sections of thick cyclone dip-legs carries out stripping with water vapor counter current contact in internal stripping section, the oil gas airway 501 of the oil gas that stripping goes out on internal stripping section cover body enters the riser 302 of two sections of thick cyclonic separators, from the catalyzer of two sections of thick cyclone dip-legs in oil gas stripping apparatus successively through secondary stripping and one-level stripping, last one section of catalyst mix behind stripping apparatus outlet at bottom place and stripping enters inclined tube to be generated.
Preferably, the diameter of the air outlet (air outlet of one section of riser 102) of one section of thick cyclonic separator 1 is less than the diameter of the inlet mouth of one section of top cyclonic separator 2; More preferably, the ratio of the air outlet cross-sectional area of one section of thick cyclonic separator 1 and the inlet mouth cross-sectional area of one section of top cyclonic separator is 1:1.05 ~ 1:1.2.
In the present invention, riser 102 outlet of one section of thick cyclonic separator 1 adopts spigot-and-socket mode to be connected with the import of one section of top cyclonic separator 2.This bayonet joint both can meet one section of isolated oil gas of thick cyclonic separator 1 and enter rapidly in one section of top cyclonic separator 2 along riser 102, can guarantee again to enter in one section of top cyclonic separator 2 from socket joint space from the stripping oil gas of the outer stripping stage 12 of annular space and stripped vapor.
Described two sections thick spin material legs 302 stretch into cover body through the sidewall of cover body 502, or stretch in cover body from the top of cover body 502 through top board.As shown in Figure 1, two sections of thick spin material legs 302 of two sections of thick cyclonic separators 3 are connected on the outer wall of cover body 502 of internal stripping section 5, and the outlet 3021 of two sections of thick spin material legs 302 is connected with the opening on cover body 502 outer wall.For above-mentioned mode of connection, the vertical range H of the base plane of outlet 3021 to the internal stripping section 5 of two sections of thick spin material legs 302 of two sections of thick cyclonic separators 3 should be controlled, to guarantee in the actual mechanical process of internal stripping section 5, the outlet 3021 of two sections of thick spin material legs 302 is positioned at the dense-phase catalyst bed 6 of internal stripping section 5.The size of H depends on the dense catalyst bed layer controlling level in internal stripping section 5, and this controlling level is by determining from the catalyst inventory of two sections in settling vessel 10, the outlet of two sections of thick spin material legs 302 of two sections of thick cyclonic separators 3 according to concrete operations condition, can arrange erosion control baffle plate or back taper in a conventional manner.
One section of leg outlet (101) and two sections of leg outlets (301) can be connected one or more thick cyclonic separator respectively, and each thick cyclonic separator can connect one or more top cyclonic separator.
The cover body 502 of internal stripping section 5 of the present invention is provided with oil gas airway 501, and oil gas airway 501 one end is connected to cover body 502, and the other end is connected with the riser 303 of two sections of thick cyclonic separators 3.Preferably, described airway is positioned at the top of cover body connecting one end of cover body, or between the dipleg and top of two sections of thick cyclonic separators position; More preferably, one end of described airway is positioned at the top of cover body.
Oil gas airway 501 has two aspect vital role: first, the oil gas go out internal stripping section 5 stripping and stripped vapor import the riser of two sections of thick cyclonic separators 3, enter two sections of top cyclonic separators 4 afterwards, thus greatly reduce two periods of oil gas residence time in settling vessel, decrease generation and the settling vessel coking of secondary reaction.Secondly, internal stripping section 5 of the present invention is in stripping process, the outlet 3021 of two sections of thick spin material legs 302 of two sections of thick cyclonic separators 3 is positioned at the dense-phase catalyst bed 6 of internal stripping section 5, the separation efficiency of two sections of thick cyclonic separators 3 is affected very little by settling vessel material level.Owing to being provided with airway 501 between the freeboard of fluidized bed, top of dense-phase bed 6 in internal stripping section 5 and two sections of thick cyclonic separator 3 riseies 303, the pressure of two sections of thick cyclonic separators 3 is made to be easy to keep balance.
The cover body 502 of internal stripping section 5 can be established one or more oil gas airway 501.Total cross-sectional area A s of oil gas airway 501 is 0.25-0.3 times of cover body 502 cross-sectional area A 1.Radical and total cross-sectional area of oil gas airway 501 are determined according to the flow of oil gas and water vapour in oily internal stripping section 5.
Outlet at bottom 9 level attitude of internal stripping section 5 exports concordant with stripping stage 8, such setting can make the cover body 502 of internal stripping section 5 run through whole stripping stage 8, guarantee two sections of abundant strippings of catalyzer, one section, two sections catalyzer are avoided to mix in stripping process, reduce oil gas in stripping process to adsorb on a catalyst, thus raising steam stripping efficiency, increase lightweight oil productive rate.
In the present embodiment, described cover body is a cylindrical shell 502, second steam sparger 503, one-level steam distributor 504 and stripping baffles 505 is provided with in cylindrical shell 502, the length of cylindrical shell 502 is greater than the length of stripping stage 8, by extending two periods of catalyzer residence time in stripping process, guarantee that two sections of catalyzer are fully by stripping, two-stage stripped vapor is set and steam can be made fully to contact with catalyzer, in order to improve steam stripped efficiency.According to the size of settling vessel 10 and two sections of thick cyclonic separators 3, in the cylindrical shell of internal stripping section 5, multilayer stripping baffles can be set.I and II steam distributor is with the structure of stripping baffles and the installation in internal stripping section 5 thereof and arrange identical with conventional FCC stripper.
Described stripping stage 8 is isometrical section of settling vessel bottom, described reducer 7 be isometrical section and isometrical section of bottom of settling vessel top between part be reducer.
Stripping stage outside, arranges stripping baffles and stripped vapor sparger around cover body outer wall.Be provided with one section of second steam sparger 701 in the lower end of settling vessel reducer 7, the steam that steam distributor 701 flows out can make the catalyzer bottom settling vessel reducer 7 keep fluidized state.The bottom of settling vessel stripping stage 8 is provided with one-level steam distributor 702, water vapour stripping one section of catalyzer again that one-level steam distributor 702 flows out, and fully ensures steam stripped efficiency.
According to actual needs, stripping baffles arranges multiple along cover body, and equally, stripped vapor sparger can arrange more than 2 according to catalyst recirculation amount.
The mode of operation of the two-stage riser fluid catalytic cracking settling vessel of slow down coking of the present invention is, a large amount of catalyzer that two sections of thick cyclonic separators are separated and entrained oil gas carry out stripping at internal stripping section and stripped vapor counter current contact, one section, then stripping stage carries out stripping to the catalyzer (carrying a small amount of oil gas secretly) separated of two sections of top spin material legs and one section of thick spin material leg outside, internal stripping section and outer stripping stage inside are equipped with stripping baffles and stripped vapor sparger, internal stripping section top is provided with baffle plate, airway is incorporated in two sections of top cyclonic separators through baffle plate by airtight in time for internal stripping section stripping gas, then enter collection chamber and leave settling vessel, this part stripping gas accounts for the overwhelming majority (the stripped oil gas phase ratio of this part stripping oil gas and outer stripping stage of whole settling vessel stripping gas, there is content large, difficult volatilization, the features such as easy coking, on settling vessel coking impact significantly), and do not enter into settling vessel upper space, outer stripping stage a small amount of stripping gas out then enters one section of top cyclonic separator from the gap location of one section of thick cyclonic separator and one section of top cyclonic separator and then imports collection chamber and leave settling vessel, catalyzer after internal stripping section and outer stripping stage stripping is then mixed into inclined tube to be generated and then removes revivifier bottom whole stripping stage.
Embodiment 1
Composition graphs 1, the two-stage riser fluid catalytic cracking settling vessel of the more detailed specific description of the present embodiment slow down coking of the present invention and the steam stripped method of oil gas.
As shown in Figure 1, catalyzer from one section of riser reactor is separated with one section of thick cyclonic separator 1 that gas-oil mixture enters in settling vessel 10 through riser tube horizontal section 101, small part catalyzer and most of oil gas enter one section of top cyclonic separator 2 through one section of thick cyclonic separator 1 riser 102, finally enter collection chamber 11.Most catalyzer after one section of thick cyclonic separator 1 is separated and a small amount of oil gas enter the reducer 7 of the outer stripping stage 12 of annular space of settling vessel 10 through one section of thick spin material leg 103, one section of top spin material leg 201 and two sections of top spin material legs 401 also have a small amount of catalyzer and oil gas to enter reducer 7, second steam sparger 701 passes into steam, the catalyzer in the reducer 7 of the outer stripping stage 12 of annular space can be made to keep fluidized state, catalyzer in reducer 7 moves to the stripping stage 8 of its lower end, reverse contact is carried out with the water vapor flowed out from one-level steam distributor bottom stripping stage 702, finally at stripping stage 8 outlet at bottom 9 place and from the catalyst mix in two sections of oil gas internal stripping sections 5, and together enter inclined tube to be generated.Entered in one section of top cyclonic separator 2 by the bell socket space of one section of thick cyclonic separator 1 riser 102 from the stripping oil gas of the outer stripping stage 12 of annular space and stripped vapor, enter collection chamber 11 subsequently.
Two sections of thick cyclonic separators 3 that catalyzer in two sections of riser reactors enters in settling vessel 10 through two sections of leg outlet horizontal sections 301 with the mixture of oil gas are separated.Small part catalyzer and most of oil gas enter two sections of top cyclonic separators 4 through the riser 303 of two sections of thick cyclonic separators 3, finally enter collection chamber 11.The catalyst entrainment part oil gas of about 90% enters internal stripping section 5 through the dipleg 302 of two sections of thick cyclonic separators together.In internal stripping section 5, catalyzer flows from top to bottom, flow from bottom to top from the one-level stripped vapor be arranged in internal stripping section 5 and secondary stripped vapor, catalyzer and stripped vapor counter current contact carry out stripping, the most of oil qi exhaustion that catalyzer adsorbs are removed.The oil gas that stripping goes out and stripped vapor enter the riser 303 of two sections of thick cyclonic separators 3 through the oil gas airway 501 of internal stripping section 5, then enter two sections of top cyclonic separators 4, finally arrive collection chamber 11.Two sections of catalyzer are after steam stripped, and catalyzer enters inclined tube to be generated at the outlet at bottom place 9 of internal stripping section 5 with the catalyst mix from annular space 12.
In above stripping process, the outlet 3021 of the thick spin material leg 302 of two sections of thick cyclonic separators 3 is positioned at the dense-phase catalyst bed 6 of internal stripping section 5, makes the separation efficiency of two sections of thick cyclonic separators 3 less by the impact of settling vessel material level.Oil gas airway 501 one section of being connected with internal stripping section 5 top is positioned at the freeboard of fluidized bed at dense-phase catalyst bed 6 top of internal stripping section 5.
Experimental example
This experimental example carries out experiment to the effect of setting up before and after cylindrical shell of the stripping stage in settling vessel and compares, specific as follows:
The two-stage riser fluid catalytic cracking settling vessel of a set of slow down coking, transformation pre-structure: settling vessel upper diameter is 6700mm, and stripping stage diameter is 3200mm, one section slightly revolve and top revolve between, two sections slightly revolve and top revolve between mode of connection entirely for being flexible coupling; All dipleg outlets of to revolve point are at settling vessel bottom reducer, and reducer bottom is stripping stage; Stripping stage is common disk ring Flapper type, totally 4 pairs of disk ring baffle plates, and bottom arranges single-stage stripped vapor sparger.Before the settling vessel transformation of this device, coking is very serious, needs periodical shut-downs coking.After adopting retrofit scheme as shown in Figure 1, set up cylindrical shell, settling vessel upper dimension is constant, and whole stripping stage diameter is 4000mm, and internal stripping section diameter is 2800mm, and airway is arranged in the center of internal stripping section top flap, and diameter is 140mm.Wherein, the process of two-stage riser fluid catalytic cracking is identical.Although still there is coking phenomenon in settling vessel after transformation, but the cycle of shut-down coke cleaning extends greatly, be extended for about 2 times of original coke cleaning period, coking phenomenon be improved significantly, and steam stripping efficiency increases after transformation, after stripping, reclaimable catalyst coke content significantly reduces, operational condition and the results are shown in Table 1.
Table 1 operational condition and result
Claims (10)
1. the two-stage riser fluid catalytic cracking settling vessel of a slow down coking, comprise: settling vessel shell (001), settling vessel enclosure is provided with one section of thick cyclonic separator of riser tube (1), one section of top cyclonic separator (2), two sections of thick cyclonic separators of riser tube (3), two sections of top cyclonic separators (4), it is characterized in that, in settling vessel enclosure, also be provided with internal stripping section cover body (502), cover body (502) and settling vessel shell (001) are positioned at same vertical central axis, the upper end of cover body (502) is closed, bottom is opening,
Wherein, the dipleg (103) of one section of thick cyclonic separator (1), one section, two top cyclonic separators (2,4) dipleg (201,401) be all positioned at cover body (502) outward, the dipleg (302) of two sections of thick cyclonic separators (3) stretches in cover body (502);
The inlet mouth bayonet joint of one section of thick cyclonic separator (1) air outlet and one section of top cyclonic separator (2);
It is airtight connection between the air outlet of two sections of thick cyclonic separators (3) and the inlet mouth of two sections of top cyclonic separators (4), and by airway (501), cover body (502) is connected with the riser (303) of two sections of thick cyclonic separators, one end of airway (501) is located at cover body top.
2. settling vessel according to claim 1, is characterized in that, the diameter of the air outlet of one section of thick cyclonic separator (1) is less than the diameter of the inlet mouth of one section of top cyclonic separator (2); More preferably, the ratio of the air outlet area of one section of thick cyclonic separator (1) and the inlet mouth area of one section of top cyclonic separator (2) is 1:1.0.5 ~ 1:1.2.
3. settling vessel according to claim 1 and 2, it is characterized in that, two sections of described thick spin material legs (302) stretch into cover body through the sidewall of cover body (502), or stretch in cover body (502) from the top of cover body (502) through top board; It is preferred, and the dipleg (302) outlet (3021) of two sections of described thick cyclonic separators (3) is communicated with cover body (502) is inner through the sidewall of cover body (502); Preferred, dipleg (302) outlet of two sections of described thick cyclonic separators (3) is positioned at the catalyzer dense-phase bed of cover body (502).
4. the settling vessel according to any one of claim 1-3, it is characterized in that, one end of described airway (501) is positioned at the top of cover body (502), or is positioned at position between the dipleg (302) of two sections of thick cyclonic separators (3) and top; More preferably, one end of described airway (501) is positioned at the top of cover body (502).
5. the settling vessel according to any one of claim 1-3, is characterized in that, described airway (501) is one or more, and total cross-sectional area of airway (501) is 0.25 ~ 0.3 times of cover body cross-sectional area.
6. the settling vessel according to any one of claim 1-5, is characterized in that: described cover body (502) runs through reducer (7) and the stripping stage (8) of settling vessel.
7. the settling vessel according to any one of claim 1-6, is characterized in that: in two-stage riser, and the outlet of every section of riser tube connects one or two thick cyclonic separator respectively, and each thick cyclonic separator connects one or two top cyclonic separator.
8. the settling vessel according to any one of claim 1-6, it is characterized in that, stripping baffles (505), stripped vapor sparger (503 is provided with in the inside of cover body (502), 504), space outside cover body and in settling vessel, around cover body outer wall, stripping baffles and stripped vapor sparger (701,702) are set.
9. the settling vessel according to any one of claim 1-8, it is characterized in that, the lower end of described cover body (502) and the outside nethermost stripped vapor sparger of cover body (502) on same level position, and cover body (502) bottom inside and outside be communicated with.
10. the settling vessel according to any one of claim 1-8, is characterized in that, described one section, two sections thick cyclonic separators (1,2) connect with the outlet of one section, two sections riser reactors (101,301) respectively.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110129076A (en) * | 2019-04-23 | 2019-08-16 | 湖南现代环境科技股份有限公司 | A kind of biomass low temperature charcoal gas combined production device, biomass low temperature charcoal vapour combined production device and biomass low temperature charcoal vapour co-production |
| CN113828067A (en) * | 2021-10-25 | 2021-12-24 | 中国石油大学(北京) | Gas-solid separation device capable of slowing down coking and separation method thereof |
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| CN110129076A (en) * | 2019-04-23 | 2019-08-16 | 湖南现代环境科技股份有限公司 | A kind of biomass low temperature charcoal gas combined production device, biomass low temperature charcoal vapour combined production device and biomass low temperature charcoal vapour co-production |
| CN113828067A (en) * | 2021-10-25 | 2021-12-24 | 中国石油大学(北京) | Gas-solid separation device capable of slowing down coking and separation method thereof |
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