CN100395011C - Regenerated catalyst steam-stripping method - Google Patents
Regenerated catalyst steam-stripping method Download PDFInfo
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- CN100395011C CN100395011C CNB2004100838890A CN200410083889A CN100395011C CN 100395011 C CN100395011 C CN 100395011C CN B2004100838890 A CNB2004100838890 A CN B2004100838890A CN 200410083889 A CN200410083889 A CN 200410083889A CN 100395011 C CN100395011 C CN 100395011C
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Abstract
The present invention relates to a method for steam stripping of a regenerated catalyst. The method comprises the steps that the regenerated catalyst is put into the stripper and contacts reversely a stripping medium to remove smoke gas carried by the regenerated catalyst; after steam stripping, the regenerated catalyst is moved from the stripper. One or more than one filler layer is arranged inside the stripper; an inner component forming the filler layer comprises more than two auxiliary guide vanes and two main guide vanes, and the main guide vanes are permanently connected with auxiliary guide vanes in a shape like the Chinese character 'Ba'. The method can reduce obviously regenerating smoke gas carried by the regenerated catalyst.
Description
Technical field
The present invention relates to a kind of regenerated catalyst steam-stripping method 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.
In catalytic cracking process, especially for being for the catalytic pyrolysis process of main purpose with yield-increasing gas alkene, in the product based on gas products.Can carry a certain amount of flue gas secretly behind the catalyst regeneration, when the oil ratio that is adopted is big, when the catalyst circulation amount is big, just having considerable flue gas to be brought into reactor becomes foreign gas.This has not only increased the load of gas compressor, and has increased difficulty of post-processing.Therefore, except that reclaimable catalyst needs stripping, regenerated catalyst is also needed stripping.
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
The objective of the invention is to provide on the basis of existing technology a kind of novel regenerated catalyst steam-stripping method, so that remove the flue gas that regenerated catalyst is carried secretly as much as possible.
A kind of regenerated catalyst steam-stripping method may further comprise the steps: regenerated catalyst is entered in the stripper, contact with the stripping medium counter flow, to remove the flue gas that regenerated catalyst is carried secretly, the regenerated catalyst behind the stripping leaves stripper; Be provided with one or more layers of packing layer in the described stripper, and the inner member that constitutes described packing layer 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; Plural inner member is required to be arranged in parallel together compactly seriatim according to above-mentioned angle, and staggered stacked according to the inner member of arranging with quadrat method with another group, the alternate angle between two groups of inner members is 60-120 °.
Compared with prior art, gas stripping process provided by the present invention has following characteristics:
Adopt gas stripping process of the present invention 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.
Adopt the method for the invention to carry out stripping, there is not the fluidisation dead band in the stripper, promptly without any the place that can allow catalyst stop to flow, the problem such as the not smooth thereby catalyst that produces when having avoided the fluctuation of catalyst quality flow rate flows has improved the operating flexibility of device.
Because stripping 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 has a bigger catalyst inventory, thereby can improve the time of staying of catalyst in stripping section, can reach the purpose that improves steam stripping efficiency and increase treating capacity.
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, Fig. 6 are the schematic flow sheet of method provided by the present invention.
Fig. 7 is the schematic diagram of cold conditions experimental provision described in the embodiment.
The specific embodiment
(1), inner member of the present invention
Inner member of 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 the gap width of fixedlying connected with auxiliary guide vane between these two major flow blades of a side is the 5-30% of auxiliary guide vane width, i.e. 0.05-0.3W1.
In inner member of the present invention, as shown in Figure 1, formed angle α is 60-120 ° between described auxiliary guide vane 1 and the major flow blade 2, 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 normal distance W3 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/stripping section inside diameter D: 50-200, preferred 1: 80-180.
(2), the method to set up of inner member of the present invention
The method to set up of inner member of 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.
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.
Except above-mentioned two kinds of methods, can also in stripper, be provided with more than one deck by packing layer that above-mentioned inner member constituted.Each layer filler all can axially be provided with perpendicular to stripper, and the height of each layer filler accounts for the 10-80% of stripper inner catalyst dense-phase bed height, preferred 20-50%.And the method to set up of included inner member adopts above-mentioned two kinds of methods all can in described each packing layer.The present invention preferably is provided with the 2-6 layer by packing layer that above-mentioned inner member constituted in stripper.
Further specify method provided by the invention below in conjunction with accompanying drawing, but therefore the present invention is not subjected to any restriction.
As shown in Figure 5, regenerated catalyst is incorporated into the regenerated catalyst stripper 12 from inclined tube 13, under the effect of the stripping medium that comes out from distributor 15, regenerated catalyst is flowed through from top to bottom by the stacked packing layer that forms 14 of described inner member,, be delivered to reactive moieties and recycle after regenerator sloped tube 16 is discharged.The flue gas that stripping medium and stripping come out is discharged by pipeline 11.Described gas can enter flue, also can enter in the regenerator dilute phase space.
The difference of Fig. 6 and Fig. 5 is: be provided with three layers of stripping filler in the regenerated catalyst stripper, regenerated catalyst is flowed through behind three layers of stripping filler from top to bottom successively, discharges through regenerator sloped tube, is delivered to reactive moieties and recycles.
In the method for the invention, main operating condition and conventional FCC stripper in the stripper are basic identical, 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 implementation result of the present invention, but therefore the present invention is not subjected to any restriction.
Embodiment
This embodiment explanation: adopt the exhaust gas volumn that regenerated catalyst is carried secretly behind the gas stripping process provided by the present invention obviously to reduce.
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 adopted of experiment is 200mm, and height overall is 1.5m, and according to shown in Figure 5 inner member of the present invention is set in this stripping section; 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 is simulated the flue gas of catalyst entrainment the industrial stripper.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 (17)
1. regenerated catalyst steam-stripping method, may further comprise the steps: regenerated catalyst is entered in the stripper, contact with the stripping medium counter flow, to remove the flue gas that regenerated catalyst is carried secretly, the regenerated catalyst behind the stripping leaves stripper; Be provided with one or more layers of packing layer in the described stripper, and the inner member that constitutes described packing layer 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; Auxiliary guide vane and major flow blade are rectangle, and two major flow blades are that upper and lower bottom surface is the splayed placement to grow the limit, and the auxiliary guide vane more than two is arranged in parallel on the upper bottom surface of two major flow blades; Packing layer is set in stripper as follows: making the long limit and the formed angle β of horizontal direction of the major flow blade of described inner member is 25-60 °, and makes between the adjacent inner member fixedly connected; The stripping space is filled full with described inner member; Plural inner member is required to be arranged in parallel together compactly seriatim according to above-mentioned angle, and staggered stacked according to the inner member of arranging with quadrat method with another group, the alternate angle between two groups of inner members is 60-120 °.
2. according to the method for claim 1, it is characterized in that described auxiliary guide vane is parallel to each other, and theirs is measure-alike.
3. according to the method for claim 1, it is characterized in that the width W 2 of described major flow blade and the ratio of stripper/stripping section inside diameter D are 1: 50-200.
4. according to the method for claim 1, 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.
5. according to the method for claim 4, 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.
6. according to the method for claim 1, the size that it is characterized in that described two major flow blades is identical.
7. according to the method for claim 1, 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.
8. according to the method for claim 7, 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.
9. according to the method for claim 1, it is characterized in that the angle γ between described two major flow blades is 60～120 °.
10. according to the method for claim 9, it is characterized in that the angle γ between described two major flow blades is 65-110 °.
11., it is characterized in that fixedlying connected that the gap width between two major flow blades of a side is the 5-30% of auxiliary guide vane width with auxiliary guide vane according to the method for claim 1.
12., it is characterized in that the angle α that coupled two of described auxiliary guide vane are between the determined plane, two limits of major flow blade of splayed setting is 60-120 ° according to the method for claim 1.
13., it is characterized in that the angle α that coupled two of described auxiliary guide vane are between the determined plane, two limits of major flow blade of splayed setting is 65-110 ° according to the method for claim 12.
14. according to the method for claim 1, the width W 1 that it is characterized in that described auxiliary guide vane equals to be the ultimate range W3 between two major flow blades that splayed is provided with.
15., it is characterized in that in stripper, being provided with as follows packing layer: the inner member of requirement is processed into filling block earlier, the stripping space is filled full with filling block then according to the method for claim 1; In described filling block, the formed angle β of the long limit of the major flow blade of 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.
16., it is characterized in that described filling block is the filling block of regular shape according to the method for claim 15.
17., it is characterized in that the 1-6 layer being set at packing layer described in the stripper according to method arbitrary among the claim 1,15,16.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100838890A CN100395011C (en) | 2004-10-22 | 2004-10-22 | Regenerated catalyst steam-stripping method |
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| CNB2004100838890A CN100395011C (en) | 2004-10-22 | 2004-10-22 | Regenerated catalyst steam-stripping method |
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| CN1762566A CN1762566A (en) | 2006-04-26 |
| CN100395011C true CN100395011C (en) | 2008-06-18 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102019211B (en) * | 2009-09-10 | 2012-07-25 | 中国石油化工集团公司 | Equipment and method for degassing regenerated catalyst |
| US10913044B2 (en) * | 2017-07-14 | 2021-02-09 | Technip Process Technology, Inc. | Device for gas solids fluidized system to enhance stripping |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6224833B1 (en) * | 1998-12-15 | 2001-05-01 | Koch-Glitsch, Inc. | Apparatus for contacting of gases and solids in fluidized beds |
| CN1335356A (en) * | 2001-08-22 | 2002-02-13 | 中国石化集团洛阳石油化工工程公司 | Stripping method and equipment for hydrocarbon catalytic converting catalyst |
| 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 CNB2004100838890A patent/CN100395011C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6224833B1 (en) * | 1998-12-15 | 2001-05-01 | Koch-Glitsch, Inc. | Apparatus for contacting of gases and solids in fluidized beds |
| CN1335356A (en) * | 2001-08-22 | 2002-02-13 | 中国石化集团洛阳石油化工工程公司 | Stripping method and equipment for hydrocarbon catalytic converting catalyst |
| 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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| CN1762566A (en) | 2006-04-26 |
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