CN201776134U - Catalyst stripping equipment - Google Patents

Abstract

The utility model discloses catalyst stripping equipment, which solves the problem in the prior art that a stripping steam stand pipe (1) is less wear-resistant to stripping steam. The equipment is composed of a cylinder body (9) and at least one stripping unit, the stripping unit comprises a conical baffle (4), a conical apron board (5), a ring baffle (6), a guide sleeve pipe (3) and a ring-shaped apron board (7), as well as the stripping steam stand pipe (1) and a stripping steam ring pipe (8). The utility model is characterized in that the top of the guide sleeve pipe (3) is articulated on the conical baffle (4), the lower end of the guide sleeve pipe (3) extends out of the bottom of the conical apron board (5), and the extending part ranges from 5 to 100 mm in length.

Description

A kind of catalyst stripping equipment

Technical field: the utility model relates under the situation that does not have hydrogen, the catalytic cracking of hydrocarbon ils, particularly a kind of equipment that is used for stripping catalyst particle entrainment or adsorbed gas.

Background technology

Fluid catalytic cracking (FCC) is the important secondary operations technology that the oil heavy end is processed into light fraction, occupies considerable status in petroleum refining industry.Catalytically cracked gasoline is the important source of commodity motor petrol.In riser fluid catalytic cracking, the oil heavy end comprises decompressed wax oil, wax tailings, reduced crude, decompression residuum, solvent deasphalting wet goods hydrocarbon ils, cracking and condensation reaction take place under the effect of catalytic cracking catalyst, generate dry gas, liquefied gas, gasoline, diesel oil, the heavy oil that comprises recycle oil and slurry oil and coke.In order to reach ideal raw material oil conversion ratio, feedstock oil needs certain reaction temperature, the oil gas time of staying in riser reactor.Conventional catalytic cracking unit, riser outlet temperature be mostly more than 500 ℃, general 2～3 seconds of the oil gas time of staying.Because there is landing in catalyst in riser, the time of staying of catalyst in riser is long more than the oil gas time of staying, generally at 4～10 seconds.Catalyst constantly has coke to generate and is deposited on catalyst surface and the activated centre in the process that rises along riser, and catalyst activity is descended gradually.Catalyst has not only deposited the generation coke, because catalyst itself is microsphere porous material, all can carry or adsorb hydrocarbon ils secretly between catalyst granules endoporus and the catalyst in the catalytic cracking reaction process.

The FCC technology technology that to be hydro carbons contact at reaction zone with microsphere particle shape catalyst, in the FCC process catalyst both played promote cracking reaction effect, it also is the carrier that heat is transmitted, being in fluidized state at catalyst reactor, is to adopt riser reactor to carry catalyst and hydrocarbon feed at present.Carrying out along with cracking reaction, a large amount of heavy hydrocarbons is condensed into coke laydown on catalyst, the catalyst that contains charcoal is called spent agent, these are deposited on coke on the catalyst and contact with oxide by catalyst in the renewing zone and carry out high temperature and burn, catalyst burns the back and recovers active, recycles.Catalyst from the recovery activity of regenerator claims regenerative agent to be recycled to reactor, utilizes gas fluidized catalyst, makes its conveying that circulates between reactor and regenerator.Because catalyst activity of such catalysts in regenerative process can not recover fully, therefore in the catalytic cracking reaction process from reaction zone exclusive segment spent agent, continuous fresh makeup catalyst is to keep the activity of catalyst in reactor.

Hydrocarbon ils and catalyst are behind the riser reactor internal reaction, method by impact or centrifugation makes reacted hydrocarbon steam separate with catalyst granules, having a large amount of hydro carbons in separation process remains in the catalyst sky or between the catalyst, if do not handle, these hydro carbons enters regenerator with catalyst and burns as coke, cause the hydrocarbon products yield to reduce and waste, this part hydro carbons of burning as coke is known as stripping Jiao.Therefore normally adopt steam stripped method, with remain in the catalyst and between the hydro carbons stripping come out, improve the yield of hydrocarbon products, reduce coke yield, therefore stripping apparatus is to reduce to remain in the catalyst hydro carbons efficiently, reduces stripping Jiao's effective ways.

Improve the method for removing hydro carbons residual in this part catalyst, normally adopt and before reclaimable catalyst enters regenerator, utilize stripping, but reduce stripping Jiao, the yield of the purpose product of raising FCC technology and the economic benefit of whole device by steam stripped method.

In catalyst stripping equipment, stripping section is the nucleus equipment of stripping apparatus key, on the stripping section conical disc, increase aperture, can make that reclaimable catalyst and stripped vapor are reverse to be contacted, improve Srteam Stripping effect, increase the purpose product yield, reduced the green coke amount, but in this structure the stripped vapor standpipe and conical baffled between a slit is arranged, when catalyst contacted with stripped vapor, because the flow resistance in this slit is smaller, the entrainment with steam catalyst can flow out conical baffled by this slit, so not only cause the heavy wear of stripped vapor standpipe, also cause the incomplete consequence of stripping.

Stripped vapor standpipe wear reason mainly is after reclaimable catalyst enters stripping section from settler, because the effect of conical baffled and ring baffle, catalyst is descending along zigzag.Stripped vapor comes out from the stripped vapor endless tube of stripping section bottom, conical baffled up with effect lower edge zigzag ring baffle.For making reclaimable catalyst and stripped vapor full contact; need weld the skirtboard of a bottom in conical baffled bottom with even distribution isoceles triangle v notch v; like this; between conical baffled bottom and skirtboard, form a dilute phase space; make part stripped vapor entrained catalyst up from the space between protective casing and the guide thimble; cause short circuit, the catalyst on the conical baffled top of disturbance causes the stripped vapor standing tube outer wall and damages because of wearing and tearing.

In order to solve stripped vapor standing tube outer wall wear problem; someone has set up protective sleeve outer surface and guide thimble outside; and respectively at its outer surface and inner surface surfacing wearing layer; the about 3mm in space between protective casing and the guide thimble; increase the service life that protective casing and guide thimble surfacing wearing layer have prolonged the stripped vapor pipe like this; but fundamentally not solving stripped vapor and entrained catalyst passes through between this space; the wear problem of taking a shortcut and being caused, the stripped vapor standpipe still can leak because of wearing and tearing after using a period of time.Also have the people directly the stripped vapor standpipe be welded on conical baffled on, like this can be in temperature-rise period, can be because stripped vapor standpipe dilatancy, will conical baffledly draw and be out of shape or the drawing crack of stripped vapor standpipe is caused damage.

The wearing and tearing of stripped vapor standpipe can make Srteam Stripping effect descend, and the purpose product yield descends, and coke yield increases, and economic benefit descends, and influence the economic benefit of device.Therefore the stripping section that does not have wearing and tearing is that this area is badly in need of and is anxious for.

The utility model content:

The utility model from technology, changes the structure of stripping section fully analyzing under the stripped vapor standpipe abrasion mechanism prerequisite, makes the stripped vapor standpipe not produce wearing and tearing.

In order to solve the problem that prior art exists, overcome its disadvantage, the utility model proposes a kind of new catalyst stripping apparatus.

A kind of catalyst stripping equipment of the utility model, at least contain 1 steam stripping unit and consubstantiality 9, steam stripping unit is by conical baffled 4, taper skirtboard 5, ring baffle 6, guide thimble 3 and annular skirtboard 7, and stripped vapor standpipe 1 and stripped vapor endless tube 8 compositions, it is characterized in that: guide thimble 3 tops are connected on conical baffled 4, the riveted joint of preferred guide thimble 3 tops, peg graft, hinged, be welded on conical baffled 4, preferably guide thimble 3 welded top are on conical baffled 4, guide thimble 3 lower ends extend to 5～100mm outside taper skirtboard 5 bottoms, be preferably 5～80mm, preferred especially 5～60mm.

Stripping apparatus guide thimble described in the utility model 3 lower ends are free end.

The utility model is owing to extend to guide thimble 3 outside taper skirtboard 5 bottoms, the resistance that makes slit between stripped vapor standpipe 1 and the guide thimble 3 is greater than 5 external drags of taper skirtboard, steam and catalyst can fundamentally not solve stripped vapor standpipe 1 wear problems from up between stripped vapor standpipe 1 and the guide thimble 3.

Stripping apparatus described in the utility model is applicable to the stripping that contains hydrocarbon ils in the catalyst, is particularly suitable for the stripping that catalyst is microspherical catalyst, particularly fluidized catalytic cracking catalyst, improves the light oil productive rate, reduces coke yield.

Owing to cancelled the surfacing wearing layer of protection tube and protection tube outer surface and guide thimble inner surface; the stripping apparatus of the utility model structure, simple in structure, cost is low; guaranteed 1 free wxpansion of stripped vapor standpipe, made stripped vapor not produce wearing and tearing stripped vapor standpipe 1.

Description of drawings

Fig. 1 is the structure chart that the utility model catalyst stripping equipment is made up of 4 steam stripping unit.

Fig. 2 is the partial structurtes figure of the utility model catalyst stripping equipment.

Fig. 3 is the partial structurtes figure of the catalyst stripping equipment of prior art.

1. stripped vapor standpipe, 2. protective casing, 3. guide thimble is 4. conical baffled, 5. taper skirtboard, 6 ring baffles, 7. annular skirtboard, 8. stripped vapor endless tube, 9. cylindrical shell.

The specific embodiment

Form catalyst stripping equipment as Fig. 1 by 4 stripping sections, by stripped vapor standpipe 1, skirtboard 2, ring baffle 6, annular skirtboard 5, guide thimble 3, conical baffled 4 form, stripped vapor standpipe 1 lower end is connected with stripped vapor endless tube 8, stripped vapor passes 4 respectively by annular skirtboard 7, ring baffle 6, skirtboard 5, guide thimble 3, conical baffled 4 stripping sections of forming, in the reverse process that contacts of stripped vapor and catalytic cracking catalyst, go out to remain in hydrocarbon ils in the catalyst with steam stripping.

Catalytic cracking catalyst stripping apparatus stripping section is local as shown in Figure 2 schemes, and stripped vapor standpipe 1 passes guide thimble 3, and guide thimble 3 is welded on conical baffled 4, and guide thimble 3 lower ends extend to 70mm outside skirtboard 5 bottoms.

Claims (5)

1. catalyst stripping equipment, form by at least 1 steam stripping unit and cylindrical shell (9), steam stripping unit is by conical baffled (4), taper skirtboard (5), ring baffle (6), guide thimble (3) and annular skirtboard (7), and stripped vapor standpipe (1) and stripped vapor endless tube (8) composition, it is characterized in that: guide thimble (3) top is connected on conical baffled (4), and guide thimble (3) lower end extends to the outer 5～100mm in taper skirtboard (5) bottom.

2. according to the described catalyst stripping equipment of claim 1, it is characterized in that: guide thimble (3) welded top is on conical baffled (4).

3. according to the described catalyst stripping equipment of claim 1, it is characterized in that: guide thimble (3) lower end extends to the outer 5～80mm in taper skirtboard (5) bottom.

4. according to the described catalyst stripping equipment of claim 1, it is characterized in that: guide thimble (3) lower end extends to the outer 5～60mm in taper skirtboard (5) bottom.

5. according to the described catalyst stripping equipment of claim 1, it is characterized in that: guide thimble (3) lower end is a free end.

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