DE1767364C - Device for the regeneration of a catalyst excretion from 1667308 - Google Patents

Description

* 4

pointing dichiphase bed. The cracked products, as well as compound, with the inside of the regeneration chamber Amounts of catalyst carried along are reduced and are preferably separated from one another, wolassen the reactor bed at the level of the level 16 and by the effects of fluctuations in the arrive at a cyclone separator 60, in which bed height is mitigated. The withdrawal stand entrained catalyst deposited and 5 lines are cylinders with them downwards Conical sections extending back to the sealing phase bed via a dip tube 61, the bottom to be led. The separated gaseous products of the regenerator 20 prevail. In the lower slopes from cyclone separator 60 via line 62, the dedicated lines 31, 32 are openings 34, to a collecting chamber 63, which is also attached to the top 35 in such a way that it is less than 180 ° des would take gaseous products from others, not to the extent of taking and preferably from provided Zykloaabscheidem can serve. From this inlet 22 facing away for the spent catalyst Collection chamber 63 will be the product vapors are over. This is how the one behind these windows works a product line 6 ″ to the non-illustrated 34, 35 lying section of the respective dedicated line Fractionation and extraction systems transferred. as a screen against a direct transfer of the catalytic converter

In the course of the catalytic cracking process, ssator accumulates from the inlet to the outlet standpipe.
Coke settles on the flowable solid catalyst. The openings 34 and 55 ensure one off. The latter is withdrawn via a standpipe 13 from the more uniform catalyst flow from the Regene reactor and passed into the stripper 15, rator 20 contained dense phase solid fluid bed in which the entrained and trapped carbon through the standpipes 31 and 32 than previously hydrogen by using a steam for-njngsring 17 ao was common. This improvement can be displaced, in particular, the exhaustion steam introduced. The latter is noticeable when the bed of the dense phase under the catalyst located at the bottom of the stripper * 15 descends from the upper ends of the stand-by lines 31 and 32 via the return pipe 14, slide 18 and inlet. This can occur, for example, when line 21 is entered into regenerator 20. According to suddenly the feed rate of the through the F ι g. 1 and 2 opens the inlet conduit 21 decreases 24 the air supplied via z $ air guide ring. In a tangential inlet 22 in the lower cylinder absence of such openings it comes when threshing part of the regenerator 20. The dense phase bed mirror decreases to a relatively strong one

! there is a dense phase bed in the regenerator Malfunctions in the operation of a regenerator,

with an upper filling level 25, below which the openings also allow an effective

Inlet line 21 the used catalyst as 30 shortening of the dedicated lines and (if desired) Introduces sealing phase. As a result, local high levels of work with reduced dense phase bed mirror Avoid temperatures that occur when gel (in the regenerator) without disrupting the catalyst flow

oxygen-rich air on catalyst is interrupted with high. Since the dedicated lines 31 and 32

Carbon content meets the tangential inlet 22 leads to a more uniform density at the catalyst extraction point

the parts of the catalyst with a horizontal line are drawn off above the openings

processing component in the regenerator. Since this also leads to a more uniform flow level of the catalyst

Dense phase bed through the cylinder wall of the regenerator. This is due to the fact that the catalog

rator vessel 20 is limited, v / ird the particles a lysator above the openings and in the stand -

Vortex movement granted. The catalyst removal from lines of the otherwise otherwise regenerator

the regenerator takes place via dedicated lines 31 and 40 seeing turbulence with large pockets from above

32, which are arranged at a distance from the inlet 22. Is separated on rising gas. With known devices

In this way, the lines supplied via inlet 22 will reduce the occurrence of rising gas products

Catalyst a circular trajectory between a bump (the fluidized bed), an irregular one

see the entry and removal point. Flow and pressure fluctuations within the

Oxygen-containing gas, for example air, is 45 withdrawal lines and thus for vibrations of the

The latter is made responsible via a line 23 and a feed ring 24. The service

introduced into the regenerator 20 with several nozzles. person can have this irregular flow and d. .-

The feed ring 24 is to detect vibrations concentrically in the bottom part.

of the regenerator 20 below the Dichtphasenspie- To a larger amount of catalyst through the

gels. 25 arranged, and its nozzles are more advantageous to direct windows 34, 35 are on the dedicated lines

at intervals over the lower part of the feed 31, 32 on the underside of the window guide plate «38, 39

Rungsringes 24 distributed or can be strengthened in the direction of the vortex, widening from the Fensterur.terseite

be inclined. upwards and outwards to one a little below that

The respective upper side of the window, which flows in through the tangential inlet 22, extend Catalyst particles are suspended in the regenerator gas and fulfill a double task, in addition to the dated, whereby the resulting suspension has many vortices generated in a horizontal plane! properties of a liquid can be recognized. That is due to the movement through the gas stream to the center of the contact catalyst particles Adhering coke or coal zone in the regenerator 20 is a loroid-shaped strösto ff containing material is created by the oxygen flow path, which is the particle movement Regeneration gas «'burned. 60 one perpendicular? Component granted. Which are in the

As mentioned, the catalyst is removed from the disperse phase of the contact zone separating part

the regenerator 20 'j via the dedicated lines 31 and Chen have the tendency to stick to the walls of the contact

32, of which the former falls over a slide 36 and zone. The one at the bottom of the window

Catch a standpipe 3 with the input riser 10 and provided funnel-like guide plates 38, 39 the latter via a slide 37 and a standpipe 6 65 but the downward trundling catalyst and lead

mk of the circulatory riser 12 is connected. The him into the discharge lines 31, 32 into it, where-

The upper ends of the dedicated lines 31 and 32 are due to the amount of catalyst discharged and are greater the top of the fluidized bed sealing phase 25 becomes more uniform in the open. At the same time, the guide plates steer

38, 39 but also rising regeneration gases away from the discharge windows and thus prevent theirs Pass through the window.

The combustion gases leaving the dense phase bed level 25 together with the catalyst particles entrained therein flow through the separation space in the top of the regenerator 20 via an inlet 41 in a gas-solids cyclone separator 40. The solids separated in the cyclone separator 40 arrive back into the regenerator bed via a dip tube 42. The immersion tube outlet 43 is arranged so that the recirculated solids in the direction of the vortex flow through the tangential inlet 22 Introduced catalyst arrive. Surprisingly, by the cyclone separator 40 from the The amount of solids separated from exhaust gases is the amount of solids from the reactor 11 via the inlet line 21 to the regenerator 20 Exceed the amount of catalyst delivered. For example, the returned via the immersion tube 42 The amount of catalyst is about 120% of the amount of catalyst conveyed back via the inlet line 21, so that by recycling the former portion of the catalyst in the direction of the eddy flow this is considerably increased. Those from the cyclone separator 40 Exiting gases are passed via line 45 to a collection chamber 46, which also contains the exhaust gases from ! Other Zykonabscheidern, not shown, can accommodate. That is in the collection chamber 46 collecting gas is discharged via a vent line 4 '.

F i g. 2 shows a section through the device

according to FIG. 1, with further cyclone separators:

with immersion pipes 42 'or 42 "and immersion pipe outlet openings 43' or 43" and nozzles 30 of the feed ring ring 24 are shown.

Exemplary operating conditions for the

ίο Invention principle working regenerator of a kata Lytic liquid cracking plants are roughly as follows

Regenerator bed temperature (° C) 621 Peak regenerator pressure (atg) 1.41

is supply of used catalyst to the

Regenerator (// min.) 16.5

Catalyst carried along by the cyclone separator to the regenerator bed (f / min.) 20

so Specific coke burning rate (kg / hr, kg catalyst) 0.08

Carbon on spent catalyst

(Weight percent) 1.0

Carbon on regenerated catalyst

as (weight percent) 0.4

Regeneration vessel inner diameter (cm) 608

1 sheet of drawings

Claims (4)

table fluid cracking, in which a hydrocarbon is brought into contact with one of the patent claims consisting of flowable solids: catalyst is brought into contact in a reaction zone and the at least partial conversion 1. Apparatus for regenerating a catalyst used in a 5 development of the hydrocarbon in the desired pro-fluidcracking process, with products with simultaneous coke deposition on a regeneration chamber for receiving a catalyst. The coke deposits on the solid fluidized bed in its lower section, pointing catalyst is constantly withdrawn and transferred as a means for introducing an oxygen-containing dense phase into the dense phase of a regeneration gas in the regeneration chamber, means to the io zone, in which it is with an oxygen introduction of non-regenerated catalyst-containing gas is brought into contact, where the in the regeneration chamber and means for coke is at least partially burned and the catalyst is regenerated gaseous combustion products. The regenerated catalyst and means (31, 32) for removal is continuously withdrawn from the regeneration zone of the regenerated catalyst from the Regenc RIE i $ and returned to the reaction zone. In the sealing chamber (20), which has a cylinder, phase bed of the regeneration zone, a vortex can be generated on its upper side in open communication with movement, thereby lengthening the path of the particles penetrating the interior of the regeneration chamber at the zone.
Top of the operating level (25) of the fluidized bed present in the more precise, the essence of the invention consists in a device for regenerating a catalyst used in one characterized in that the Zy fluid cracking process, with linder in its lower part has at least one under a regeneration chamber for receiving half of the fluidized bed filling height (25) with the interior solid fluid bed in its lower section, means of the regeneration chamber ^ 20) in open connection for the introduction of an oxygen-containing gas into the connecting opening (34, 35) . as regeneration chamber, means for introducing 2. Device according to claim 1, characterized in that the catalyst is not regenerated in the regeneration, that on the cylinder below the open chamber as well as means for discharging gaseous Vernung an upward and outward inclined Lest combustion products from it and a device for plate (38, 39) is attached. Removal of the regenerated catalyst from the 3. Apparatus according to claim 1 or 2, characterized in 30 generating camera which has a cylinder, characterized in that in front of the cylinder there is a case which on its top side is in open communication with The niche section down through the bottom of the interior of the regeneration chamber to the top regeneration chamber (20) extends. side of the operating level of the in the chamber 4. Device according to one of the preceding those fluidized bed, the device thereby Claims, characterized in that the one 35 is characterized in that the cylinder in its lower direction at least one maintenance fluid bed filling level for discharging unregenerated catastrophe lysator into the regeneration chamber (20) one with the interior of the regeneration chamber in the open Having dense phase solids introduction line having communicating opening. at a point below the operating level of the preferably is on the cylinder below the opening in the regeneration chamber existing flow 40 a baffle is attached that up and out bed leads tangentially into this chamber, and is inclined. There can be a conical extension from the cylinder the openings (34, 35) are arranged in such a way that they cut down through the bottom of the regeneration they extend from the entry point of the dense phase solids chamber. The facility to initiate Introductory line are turned away. of unregenerated catalyst in the regeneration 45 approximately chamber can be a dense phase solids introduction line have that at a point below the Operating level of the in the regeneration chamber existing fluidized bed tangentially into this chamber leads into it, the openings in the cylinder so 50 are arranged that they are from the entry point of the sealing The invention relates to an improved device phase-solids introduction line are turned away,
for the regeneration of a catalyst used in a fluid cracking system. The following is the invention with reference to the drawing methods. explained in more detail. It shows In fluidized bed reaction vessels for solids, F i g. 1 is a flow diagram of a catalytic liquid latter, often incorporated in one section of the vessel
taken after having dealt with the gaseous material F i g. 2 shows a section along line 2-2 in FIG. 1, were implemented at the same time as Flowable - on a larger scale. making means serves. This flowability agent according to FIG. 1 are in the reactor 11 fresh is normally via some sort of distributor in the 60 gas oil via line 2 and regenerated catalyst The lower part of the vessel is initiated and from its upper part again via line 3 by means of the freshness input taken, usually via a line 10 and a second input stream from the Lei device for the separation of entrained solids. device 5, preferably cycle gas oil, and regenerated It is important that the solids fed so be catalyst from line 6 via the loop riser remain in the reaction bed until the reaction in line 12 is introduced. The circulatory riser 12 desired extent has expired. goes through the inside of a scraper 15 of the reac-die Invention relates to an improvement in relation to gate 11 through without being openly connected to it the regeneration of a catalytic converter to stand up to cataly-