CN1332747C - Internal structure of FCC stripper and its arrangement method - Google Patents
Internal structure of FCC stripper and its arrangement method Download PDFInfo
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- CN1332747C CN1332747C CNB2004100838918A CN200410083891A CN1332747C CN 1332747 C CN1332747 C CN 1332747C CN B2004100838918 A CNB2004100838918 A CN B2004100838918A CN 200410083891 A CN200410083891 A CN 200410083891A CN 1332747 C CN1332747 C CN 1332747C
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Abstract
The present invention relates to an inner member of a catalytic cracking stripper and a setting method thereof. The inner member comprises more than two auxiliary guide vanes and two main guide vanes, wherein the main guide vanes are permanently [3.1] connected with the auxiliary guide vanes in a shape like the Chinese character 'Ba'. The inner members not only can be filled in the catalytic cracking stripper one by one but also can be first processed into filling material blocks and then filled into the catalytic cracking stripper. The inner member and the corresponding setting method thereof can evidently raise stream stripping efficiency.
Description
Technical field
The present invention relates to a kind of stripper inner member and method to set up thereof that is used for catalytic cracking process.
Background technology
Fluid catalytic cracking (FCC) is a kind of important secondary processing process in the petroleum refining industry, uses heavy raw oil to produce light-end products such as gasoline, diesel oil, liquefied petroleum gas.Its key step is as follows, and hydrocarbon raw material contacts in riser with the regenerated catalyst of heat, carries out catalytic cracking reaction under 450 ℃～550 ℃; The mixture of reaction back oil gas and reclaimable catalyst enters settler, and cyclone separator separates reclaimable catalyst in settler, enters into stripper, and oil gas then enters into the subsequent product piece-rate system.Reclaimable catalyst in stripper with the water vapour counter current contacting, remove the hydrocarbons of deentrainment after, enter into and carry out coke burning regeneration in the regenerator, make catalyst recover active; Catalyst after the regeneration reenters in the riser reactor, carries out the reaction of next round.
Because catalytic cracking catalyst is the sieve and silica-sesquioxide of porous, enter in the catalyst of stripping section some oil gas absorption or be entrained in the catalyst endoporus or between the catalyst granules, according to statistics, this part oil gas accounts for 2～4% of product population, after first stripping goes out oil gas so must take measures, allow this part catalyst enter into regenerator again.Otherwise not only cause the loss of useful light-end products, and because bringing into of this part oil gas can increase the regenerator load; Secondly, because H/C can cause the generation of a large amount of water vapours than higher in this part oil gas after the burning, under the environment of high temperature, aggravated the hydrothermal deactivation of catalyst greatly.Along with catalytically cracked material becomes heavy day by day, the decline of the quality of raw material and the increase of impurity content, can bring such as environmental protection, a series of problems such as regeneration load is not enough, catalysqt deactivation is serious, product distribution variation, and the stripping that improves reclaimable catalyst is an effective way alleviating the problems referred to above.
Traditional catalyst stripping equipment is to add the herringbone baffle plate or the disc-annular shape baffle plate strengthens Srteam Stripping effect in stripping section, but two kinds of stripping baffles structures are lower except steam stripping efficiency, also there are catalyst distribution inequality, the local problems such as " bridge formations " of losing fluidization and causing thus in operation, when catalyst circulation amount in the device big, the just easier generation of these problems.Along with the change of catalytically cracked stock is heavy, coke that reaction produces and required catalyst circulation amount also increase accordingly, these two kinds of structures can not satisfy the requirement of device in economic benefit and stable operation aspect steam stripping efficiency and the operating flexibility, so need stripper, the new gas stripping process of employing of development of new.
Aspect new stripper, many patented technologies have been proposed both at home and abroad, one of them importance adopts the material filling type inner member exactly, its thinking is that bed is divided into a plurality of little flow units, in order to reduce bubble diameter in the fluid bed, improve the gas-solid mass-transfer efficiency thereby reach, improve the purpose of steam stripping efficiency.The patented technology that this respect is relevant has:
CN1335356A has proposed a kind of screen filler that is crossed as the rhombus duct that has, the axially parallel of its rhombus duct and stripper, it is said and effectively to improve stripper efficient, if be used for the catalytic cracking olefin process, can make in the regenerative agent flue gas impurity volume content less than 0.05%.But this filling-material structure is easy to cause stripping dielectric distribution inequality, easily causes the local joint of gas to gush or problem such as the local bridge formation of solid, and operating flexibility is relatively poor.
CN1403190A has proposed a kind of material filling type inner member that is used for gas-liquid, the gentle liquid-solid system reinforcement of gas-solid mass transfer, and it is formed by a series of panels intersections that have the ligulate inclined hole, thereby plays the effect of bubble crushing, reaches the purpose that improves mass-transfer efficiency.
USP 5,716,585 have proposed a kind of waveform stripping filler that is used for fluidized catalytic cracker, and this stripping filler is staggered by corrugated screen, which floor is divided into is placed in the stripper, gas-solid two-phase circuitous process of flowing in filler has reached the purpose of strengthening contact and mass transfer.It is exactly that regional area forms the fluidisation dead band easily that the stripping filler of this structure has a shortcoming, and under the bigger situation of catalyst quality flow rate, catalyst is easy to generate smooth, the problem such as " bridge formation " that flows.
USP 6,224, and 833 have proposed a kind of fluid bed inner member of being made up of the many groups of tabular components that intersect each other, it is said to improve gas-solid mass-transfer efficiency in the fluid bed greatly, and when as the catalyst stripping inner member, steam stripping efficiency can improve nearly 20 percentage points.But also there is the local fluidization dead band in this stripping filling-material structure, when being used for the spent agent stripping, easily produces problems such as oil gas coking.
Summary of the invention
One of purpose of the present invention is that a kind of stripper inner member that is used for catalytic cracking process is provided on the basis of existing technology, to improve Srteam Stripping effect.
Another object of the present invention provides the method to set up of corresponding stripper inner member of the present invention.
The stripper inner member that is used for catalytic cracking process provided by the present invention comprise the auxiliary guide vane more than two and fixedly connected with auxiliary guide vane be two major flow blades that splayed is provided with, the broadside of auxiliary guide vane be relative two the less long limits of splay major flow blade air line distance and be connected.
The method to set up of stripper inner member provided by the invention is as follows: making the long limit and the formed angle β of horizontal direction of the major flow blade of plural described inner member is 25-60 °, plural described inner member is required to be arranged in parallel compactly together seriatim according to above-mentioned angle, and it is staggered stacked according to the inner member of arranging with quadrat method with another group, alternate angle between two groups of inner members is 60-120 °, and makes between the adjacent inner member fixedly connected.
Stripper inner member provided by the invention can also adopt following method setting: the inner member of requirement is processed into filling block earlier, the stripping space is filled full with filling block then; In described filling block, the formed angle β of the long limit of the major flow blade of plural inner member and horizontal direction is 25-60 °, plural described inner member is required to be arranged in parallel compactly together seriatim according to above-mentioned angle, and it is staggered stacked according to the inner member of arranging with quadrat method with another group, alternate angle between two groups of inner members is 60-120 °, and makes between the adjacent inner member fixedly connected.
Compared with prior art, stripper inner member provided by the present invention and method to set up thereof have following characteristics:
Adopt stripper inner member of the present invention and method to set up thereof can reduce the average diameter of the bubble in the stripping section effectively, thereby strengthen contact effect, raising steam stripping efficiency between the gas-solid two-phase;
The stripper that adopts inner member of the present invention and be provided with according to described method to set up, there is not the fluidisation dead band, promptly without any the place that can allow catalyst stop to flow, thereby avoided the stop of oil gas, avoided the coking of oil gas, the catalyst that produces in the time of can also avoiding simultaneously the fluctuation of the catalyst quality flow rate problem such as not smooth that flows has improved the operating flexibility of device;
Because inner member of the present invention is simple in structure and be easy to be provided with, avoided inner member to take the excessive stripping section useful space, thereby have bigger catalyst inventory, thus can improve the time of staying of catalyst in stripping section, can reach the purpose that improves steam stripping efficiency and increase treating capacity.
Inner member provided by the invention both can be used for the spent catalytic cracking catalyst stripping, can be used for the regenerated catalyst stripping again.This inner member not only can strengthen the contact effect between catalyst and the stripped vapor, but also have do not have the fluidisation dead band, prevent the oil gas coking, the advantage that treating capacity is big, operating flexibility is big.
Description of drawings
Fig. 1 is the front view of inner member of the present invention.
Fig. 2 be inner member of the present invention A-A to cutaway view.
Fig. 3 is the schematic perspective view of inner member of the present invention.
Fig. 4 is the set-up mode schematic diagram of inner member of the present invention.
Fig. 5 is for adopting the FCC regenerated catalyst stripper schematic diagram of inner member of the present invention.
Fig. 6 is for adopting the FCC reclaimable catalyst stripper schematic diagram of inner member of the present invention.
Fig. 7 is the schematic diagram of cold conditions experimental provision described in the embodiment.
The specific embodiment
Further specify stripper inner member provided by the present invention below in conjunction with accompanying drawing, but therefore the present invention is not subjected to any restriction.
Stripper inner member provided by the present invention such as Fig. 1, Fig. 2 and shown in Figure 3, this inner member is made of two kinds of blades, as shown in the figure, auxiliary guide vane 1 and major flow blade 2, wherein the effect of auxiliary guide vane 1 is that the catalyst from top to down is flowed along the direction that should assist guide vane; Major flow blade 2 is two blades that are the splayed setting of fixedlying connected with auxiliary guide vane 1, its effect is to make catalyst flow down the back from auxiliary guide vane to change flow direction once more in the process of major flow blade of flowing through, make the part catalyst when the major flow blade flows down, flow to the both sides of this inner member simultaneously.Because the horizontal movement of catalyst helps reducing the bed bubble diameter, the circuitous of the suitable fortifying catalytic agent of this inner member flows, thereby reached the effect that reduces bubble diameter, strengthens the gas-solid contact mass transfer.
As Figure 1-3, inner member of the present invention comprises two or more than two the auxiliary guide vane 1 that is arranged in parallel, and preferably comprises the auxiliary guide vane 1 that is arranged in parallel more than two.Described two or more than two auxiliary guide vane 1 preferably is made of the essentially identical auxiliary guide vane of size.The width W 1 of described auxiliary guide vane is 0.1-10 with the ratio of height H 1: 1, and preferred 0.8-5: 1.
Inner member of the present invention also comprises two major flow blades 2 that are the splayed setting of fixedlying connected with auxiliary guide vane 1, and these two major flow blades are the essentially identical blade of size preferably.The width W 2 of described major flow blade is 5-100 with the ratio of height H 2: 1, and preferred 10-90: 1.The width W 2 of described major flow blade should be specifically determined according to the size of the long limit of the shape of stripper and major flow blade and the formed angle β of horizontal direction.Angle γ (see figure 2) between described two major flow blades is 60-120 °, preferred 65-110 °, and further preferred 70-100 °.And these two be major flow blade that splayed is provided with and fixedly connected vertical range between two limits of a side with auxiliary guide vane for assisting the 5-30% of guide vane width, i.e. 0.05-0.3W1.
In inner member of the present invention, as shown in Figure 1, the angle α on the determined plane, two limits that is connected with auxiliary guide vane 1 in described auxiliary guide vane 1 determined plane and the major flow blade 2 is 60-120 °, preferred 65-110 °, and further preferred 70-100 °.
In addition, the width W 1 of the preferably auxiliary guide vane of the present invention equals to be the maximum linear distance W 3 between two major flow blades that splayed is provided with.The width W 2 of major flow blade of the present invention is 1 with the ratio of stripper or stripping section inside diameter D: 50-200, preferred 1: 80-180.
The method to set up of inner member provided by the present invention in stripper is as follows: at first, as shown in Figure 1, guarantee that the long limit and the formed angle β of horizontal direction of the major flow blade of described inner member is 25-60 °, preferred 30-55 °.Then, the angle of plural above-mentioned inner member according to angle β required to be arranged in parallel together compactly seriatim, and staggered stacked according to method shown in Figure 4 with another group according to the inner member of arranging with quadrat method.Alternate angle between above-mentioned two groups of inner members is 60-120 °, preferred 70-110 °, and make between the adjacent inner member fixedly connected.Other inner member is set according to the method described above, full getting final product filled in the stripping space.Here said fixedly connected employing this area filler processing method commonly used realizes getting final product, and the present invention does not have specific (special) requirements.And said stripping space is meant the space that beds occupied in stripper or the stripping section.
In addition, being provided with of inner member of the present invention can also be adopted following method: the basic setup method of inner member is identical with said method, but the inner member of requirement can be processed into the filling block that is easy to load of plurality of square or rectangle or Else Rule shape earlier.Make each filling block comprise some groups of staggered inner member groups, and each group comprise some inner members that are arranged in parallel, and fixedly connected between the adjacent inner member.The present invention does not have special requirement for the quantity of the concrete size of above-mentioned filling block and the inner member that comprised, those skilled in the art can require to determine according to the physical dimension of device and in conjunction with stripping, as long as under the prerequisite that satisfies the stripping requirement, can get final product with installing by convenient construction.In addition, above-mentioned filling block can also be processed into different shapes according to the requirement that the stripping space is loaded, to satisfy the requirement of filling.
Fig. 5 is the catalytic cracking regenerated catalyst stripper schematic diagram that adopts inner member of the present invention and be provided with according to above-mentioned method to set up.As shown in the figure, regenerated catalyst is incorporated into the regenerated catalyst stripper 12 from inclined tube 13, under the effect of the stripped vapor that comes out from distributor 15, the regenerated catalyst inner member 14 of the present invention of flowing through from top to bottom is after regenerator sloped tube 16 enters into riser reactor.The flue gas that stripped vapor and stripping come out enters in the regenerator dilute phase space by pipeline 11.
Fig. 6 is the spent catalytic cracking catalyst stripper schematic diagram that adopts inner member of the present invention and be provided with according to above-mentioned method to set up.As shown in the figure, oil gas that from riser reactor 21, comes out and reclaimable catalyst, through behind the primary cyclone 25, oil gas separates fast with reclaimable catalyst, and catalyst flows out from the separator dipleg, enters stripping section; Oil gas then only comes out from the separator top, enters second level cyclone separator 27, isolates remaining catalyst granules, enters in the follow-up process pipe by discharge 28 at last.The catalyst of separating from the two stage cyclone separator then enters into stripping section, and the stripping space 24 of flowing through from top to down and constituting by inner member of the present invention, with the stripped vapor counter current contacting of coming out from distributor 23, finally, catalyst flow into the regenerator from reclaimable catalyst inclined tube 22, regenerates, recover active, oil gas and stripped vapor then enter settler 26 dilute phase spaces and oil gas together through secondary cyclone 27, enter in the follow-up process pipe.
For the stripper that adopts inner member of the present invention, its main operating condition and conventional FCC stripper are basic identical in stripping process, and for example, the stripping linear speed can be controlled in 0.05-3m/s, the catalyst quality flow rate can be controlled in 30-130kg. (m
2.s)
-1
The following examples will further specify the implementation result of inner member of the present invention, but therefore the present invention is not subjected to any restriction.
Embodiment
This embodiment explanation: the implementation result of inner member of the present invention.
Fig. 7 is the structure diagram of the cold conditions experimental provision that adopts of this embodiment.This device is a ciculation fluidized device, as shown in the figure, catalyst is promoted to settler 32 in riser 37, with after the two-stage of cyclone separator 31 is separated, enter stripping section 33, after stripping finishes through eddy flow head 38, enter storage bin 34, quantitatively add pre-lifter 36 through screw feeder 35, enter into riser 37 again, carry out the next round circulation.The stripping section diameter that experiment is adopted is 200mm, and height overall is 1.5m, riser diameter 80mm, high 4.5m.In the experiment with carbon dioxide as the fluidizing gas of stripping section 33, the air of carrying secretly with the catalyst granules that flows down from settler 32 simulate catalyst entrainment the industrial stripper oil gas or flue gas.The initial concentration of nitrogen is 78% in the air of catalyst entrainment, and behind the process stripping, nitrogen gas concn constantly reduces, and the reduction value of the nitrogen gas concn in the gas of carrying secretly in the catalyst with stripping section 33 bottoms is as the stripping relative efficiency.At the stripping linear speed is 0.2m/s, and the catalyst quality flow rate is 90kg. (m
2.s)
-1Condition under, the steam stripping efficiency that adopts the stripping section of inner member of the present invention is 92%.
The computational methods of steam stripping efficiency are as follows:
Wherein, η-steam stripping efficiency, %
y
0The percentage concentration of nitrogen the gas that-catalyst that comes out from riser is carried secretly, %
The percentage concentration of nitrogen in the fluid bed emulsification interphase gas in the y-stripping section, %
Comparative Examples
Adopt experimental rig same as the previously described embodiments, but adopt traditional disc-annular shape baffle plate at stripping section, experiment process is all identical with embodiment with other operating condition, and steam stripping efficiency is 67%.
Claims (18)
1, a kind of internal structure of FCC stripper, it is characterized in that this inner member comprise the auxiliary guide vane more than two and fixedly connected with auxiliary guide vane be two major flow blades that splayed is provided with, the broadside of auxiliary guide vane be relative two the less long limits of splay major flow blade air line distance and be connected.
2,, it is characterized in that described auxiliary guide vane is parallel to each other, and theirs is measure-alike according to the inner member of claim 1.
3,, it is characterized in that the width W 2 of described major flow blade and the ratio of stripper or stripping section inside diameter D are 1: 50-200 according to the inner member of claim 1.
4,, it is characterized in that the width W 1 of described auxiliary guide vane and the ratio of height H 1 are 0.1-10: 1 according to the inner member of claim 1.
5,, it is characterized in that the width W 1 of described auxiliary guide vane and the ratio of height H 1 are 0.8-5: 1 according to the inner member of claim 4.
6, according to the inner member of claim 1, the size that it is characterized in that described two major flow blades is identical.
7,, it is characterized in that the width W 2 of described major flow blade and the ratio of height H 2 are 5-100: 1 according to the inner member of claim 1.
8,, it is characterized in that the width W 2 of described major flow blade and the ratio of height H 2 are 10-90: 1 according to the inner member of claim 7.
9,, it is characterized in that the angle γ between described two major flow blades is 60～120 ° according to the inner member of claim 1.
10,, it is characterized in that the angle γ between described two major flow blades is 65-110 ° according to the inner member of claim 9.
11,, it is characterized in that describedly being two major flow blades that splayed is provided with and fixedlying connected vertical range between two limits of a side with auxiliary guide vane for assisting the 5-30% of guide vane width according to the inner member of claim 1.
12,, it is characterized in that the angle α on the determined plane, two limits that is connected with auxiliary guide vane in the determined plane of described auxiliary guide vane and the major flow blade is 60-120 ° according to the inner member of claim 1.
13,, it is characterized in that the angle α on the determined plane, two limits that is connected with auxiliary guide vane in the determined plane of described auxiliary guide vane and the major flow blade is 65-110 ° according to the inner member of claim 12.
14, according to the inner member of claim 1, the width W 1 that it is characterized in that described auxiliary guide vane equals to be the maximum linear distance W 3 between two major flow blades that splayed is provided with.
15, the method to set up of the described internal structure of FCC stripper of a kind of claim 1, it is characterized in that making the long limit and the formed angle β of horizontal direction of the major flow blade of two the above inner members is 25-60 °, plural described inner member is required to be arranged in parallel compactly together seriatim according to above-mentioned angle, and it is staggered stacked according to the inner member of arranging with quadrat method with another group, alternate angle between two groups of inner members is 60-120 °, and makes between the adjacent inner member fixedly connected.
16,, it is characterized in that filling the stripping space with described inner member according to the method for claim 15.
17, the method to set up of the described internal structure of FCC stripper of a kind of claim 1 is characterized in that the inner member of requirement is processed into filling block earlier, fills the stripping space with filling block then; In described filling block, the formed angle β of the long limit of the major flow blade of two above inner members and horizontal direction is 25-60 °, plural described inner member is required to be arranged in parallel compactly together seriatim according to above-mentioned angle, and it is staggered stacked according to the inner member of arranging with quadrat method with another group, alternate angle between two groups of inner members is 60-120 °, and makes between the adjacent inner member fixedly connected.
18,, it is characterized in that described filling block is the filling block of regular shape according to the method for claim 17.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100838918A CN1332747C (en) | 2004-10-22 | 2004-10-22 | Internal structure of FCC stripper and its arrangement method |
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|---|---|---|---|
| CNB2004100838918A CN1332747C (en) | 2004-10-22 | 2004-10-22 | Internal structure of FCC stripper and its arrangement method |
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| CN1763150A CN1763150A (en) | 2006-04-26 |
| CN1332747C true CN1332747C (en) | 2007-08-22 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101912753B (en) * | 2010-08-13 | 2012-01-11 | 中国石油大学(北京) | Composite inner component for gas-solid fluidized bed |
| FR2966161B1 (en) | 2010-10-15 | 2013-12-20 | Total Raffinage Marketing | METHOD OF REACTING AND STRIPING STAGE IN AN FCC UNIT FOR MAXIMIZING OLEFIN PRODUCTION |
| FR2969643B1 (en) | 2010-12-27 | 2014-11-21 | Total Raffinage Marketing | CATALYTIC CRACKING PROCESS FOR TREATING A LOW CARBON CONRADSON CUT |
| FR2977257B1 (en) | 2011-06-30 | 2015-01-02 | Total Raffinage Marketing | CATALYTIC CRACKING PROCESS FOR TREATING LOW CARBON CONRADSON CUTTING. |
| FR3117895B1 (en) | 2020-12-23 | 2024-03-01 | Total Raffinage Chimie | SEPARATION AND STRIPING ENCLOSURE WITH A DEBRIS FILTRATION GRID |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5549814A (en) * | 1992-12-02 | 1996-08-27 | Uop | FCC stripper with spoke arrangement for bi-directional catalyst stripping |
| WO1998028382A1 (en) * | 1996-12-23 | 1998-07-02 | Mobil Oil Corporation | Improved fcc unit catalyst stripper |
| CN2370950Y (en) * | 1998-12-20 | 2000-03-29 | 中国石油化工集团公司 | Fluidised catalytic cracking stripping device |
| CN1485406A (en) * | 2002-09-28 | 2004-03-31 | 中国石油化工股份有限公司 | Inner component of tower disc type catalytic cracking stripping equipment |
-
2004
- 2004-10-22 CN CNB2004100838918A patent/CN1332747C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5549814A (en) * | 1992-12-02 | 1996-08-27 | Uop | FCC stripper with spoke arrangement for bi-directional catalyst stripping |
| WO1998028382A1 (en) * | 1996-12-23 | 1998-07-02 | Mobil Oil Corporation | Improved fcc unit catalyst stripper |
| CN2370950Y (en) * | 1998-12-20 | 2000-03-29 | 中国石油化工集团公司 | Fluidised catalytic cracking stripping device |
| CN1485406A (en) * | 2002-09-28 | 2004-03-31 | 中国石油化工股份有限公司 | Inner component of tower disc type catalytic cracking stripping equipment |
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