CN201776135U - Structure of descending pipe with magnetic field for slurry bed circulation flow reactor - Google Patents
Structure of descending pipe with magnetic field for slurry bed circulation flow reactor Download PDFInfo
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- CN201776135U CN201776135U CN2009202203607U CN200920220360U CN201776135U CN 201776135 U CN201776135 U CN 201776135U CN 2009202203607 U CN2009202203607 U CN 2009202203607U CN 200920220360 U CN200920220360 U CN 200920220360U CN 201776135 U CN201776135 U CN 201776135U
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Abstract
The utility model relates to a structure of descending pipe with magnetic field for a slurry bed circulation flow reactor, which comprises a descending pipe cylindrical body (1), an inverted-conical upper isolation plate (2), a lower isolation plate (6) and at least one filter tube (8) arranged in the interior. The inlet of the filter tube (8) is formed on the upper isolation plate (2) and the outlet of the filter tube (8) is formed on the lower isolation plate (6), the wall of the cylindrical body is connected with a discharge pipe (10), the range of the cone angle (3) of the upper isolation plate is 20 to 70 degrees, and an electromagnetic coil is wound outside the descending pipe to provide uniform magnetic field. The descending pipe with magnetic field can avoid accumulation of solid particles at the inlet of the descending pipe and avoid blockage of the filter tube, so as to improve separation efficiency and prolong service life.
Description
Technical field
The utility model relates to a kind of equipment and method that solid particle is separated from fluid product, can be coupled with paste state bed reactor, realizes that fluid product separates continuously with solid particle.
Background technology
Paste state bed reactor is a kind of gas-liquid commonly used (slurry) haptoreaction equipment, has high liquid storage amount.For the very big catalytic reaction process of reaction heat, use paste state bed reactor can remove reaction heat effectively, the isothermal operation of realization response device guarantees the normal operation of reactor, has therefore obtained extensive use in current chemical process.And slurry bed circulatory flow reactor is a kind of efficient heterophase reactor that grows up on the basis of slurry attitude bed bubbling reactor.Slurry bed circulatory flow reactor can also make its inner fluid do well-regulated circulating, thereby strengthen mixing, diffusion, heat transfer and mass transfer between the reactant except the whole advantages that have slurry attitude bed bubbling reactor and had.
In paste state bed reactor,, generally adopt tens microns even more fine grain catalyst, but also brought product to separate this difficult problem with catalyst granules thereupon in order to eliminate diffusion influence.How effectively to realize liquid-solid separation, become the key technology in using slurry attitude bed course of reaction.
The liquid-solid separation of paste state bed reactor catalyst slurry is generally carried out outside reactor, and the slurries that contain catalyst must use specific pump to carry, and the catalyst of separating still need send back in the reactor with the slurries form.This process is easy to cause the breakage of catalyst granules, thereby the long-time continuous operation of reactor is brought problem.
Filtering technique is a common method of obtaining high separating efficiency.Press liquid form, filtration is divided into dead-end filtration and cross-flow filtration, compares traditional dead-end filtration, and the cross-flow filtration filter cake is difficult for piling up, and filter cycle is long, is the emphasis of studying at present.
USP 6068760, WO 02/097007A2 all disclose and have adopted sedimentation techniques to realize the method for liquid-solid separation in paste state bed reactor, reacted slurries are drawn reactor, behind a sedimentation pipe, slurries enter settling tank and carry out sedimentation, supernatant liquor is discharged as product, and the thick slurry Returning reactor circulation of a large amount of catalyst granules is contained in lower floor.
The disclosed separation method of EP 1405664A1 is that reacted slurries are directly introduced settling tank, sedimentation is provided with baffle plate in irritating, and height of baffle plate is higher than liquid level in the settling tank, therefore after slurry stream is crossed the slit of baffle plate and tank base, clear liquid slowly rises and flows out above settling tank, and contains the outlet Returning reactor main body of the underflow of particle in the settling tank bottom.
CN1433838A discloses the method that separative element is set in reactor body, make slurries realize liquid-solid separation, and proposes to apply high-intensity magnetic field to quicken liquid-solid separating rate in the bottom of sedimentation unit.But utilize single sedimentation techniques to realize liquid-solid completely separation, obtain the minimum product liquid of solid content and need the very big sedimentation device of volume, to guarantee enough sedimentation times, this has just caused the most of area and the space of equipment to be taken by sedimentation device, and production efficiency is lower; Catalyst particle size is more little in addition, help reaction more and carry out, simultaneously in course of reaction because catalyst abrasion can produce the minimum pressed powder of particle diameter, but sedimentation techniques are that the separating effect of the littler catalyst granules of several microns or particle diameter is not good for particle diameter; Because Fischer-Tropsch synthesis device diameter is quite big, thereby magnetic field device is difficult in and produces uniform magnetic field in the reactor, and the equipment heaviness involves great expense, and can't carry out demagnetization to stop the reunion of magnetization catalyst to producing magnetized catalyst, influence the normal running of reactor.
WO 94/16807 discloses in reactor the method for using filter assemblies to realize liquid-solid separation, in case but catalyst granules stops up filter assemblies, the regeneration difficulty of filter assemblies then, thereby be unsuitable for large-scale continuous production.
CN1589957A discloses at inside reactor the one-level separative element has been set, the secondary separative element is set outside reactor realizes the method for liquid-solid separation, and the continued operation of back flush unit to realize filtering is set outside reactor, so not only taken the reaction compartment in the reactor, also cause the device structure complexity, operate complicated.
US 2005/0027021 discloses a kind of liquid-solid piece-rate system, realize liquid-solid separation by the filter element that vertical placement is set outside reactor, what play main filtration is the filter cake that is deposited on the filter element, by regulating the thickness that the slurries flowing velocity is regulated filter cake.But, element space of living in size determined because being design, come controlled filter speed to make adjustable range very limited by the outside slurry flow rate of regulating element merely, and fine grained stop up screen pipe easily and do not have effective back-flushing method to make filter process be difficult to realize serialization.
US 2005/0000861 discloses a kind of filter element that can be placed on inside reactor and/or outside, this element is divided into coarse filtration district and fine filtering district, and the two is coaxial with vertically placement of footpath, block oarse-grained catalyst outside filtering area in coarse filtration district, top, Returning reactor recycles again again, carries out further isolated by filtration and can directly enter the fine filtering district that is located at below the coarse filtration district through the filtrate of coarse filtration.This solid separation method need be by exterior power, and detailed back-flushing method is not provided, and is difficult to realize that liquid-solid continuous effective separates.
CN101081357A discloses a kind of slurry bed circulatory flow reactor, this reactor comprises tedge and at least one down-comer, tedge links to each other by pipeline with the down-comer two ends, tedge top is the decanting zone that caliber enlarges, the top of decanting zone is provided with exhaust outlet, be filtered medium in the every down-comer and be divided into filtrate district and slurries district, wherein lower end, filtrate district is communicated with liquid outlet opening, two ends, slurries district are connected with the two ends of tedge, this reactor can be applicable to the gas-liquid-solid phase reaction system, raw material enters reactor by the charging aperture of tedge bottom, react in tedge with the slurries mixing back in the tedge, travel up to the decanting zone then, gas-liquid separation herein, gas is discharged reactor from the exhaust outlet at top, and thicker catalyst granules relies on gravitational settling to turn back in the tedge, and the slurries that contain than finely grained catalyst enter the down-comer from the decanting zone through connecting line; The slurries main body flows downward in the slurries district vertically, and wherein a part of liquid enters the filtrate district by filter medium under the promotion of filter medium both sides pressure reduction, and finally draw as product, solid catalyst particle then continues to flow downward with the slurries main body and turns back to continuation participation reaction in the tedge by pipeline.This inside reactor relatively high pressure makes and forms pressure drop between the slurries district and filtrate district in the down-comer, promotes slurries and passes screen pipe, realizes Separation of Solid and Liquid, does not need to add motive force; Backwashing system and can flexible operating is set, makes screen pipe be easy to regeneration, thereby guaranteed the continued operation of whole reactor; Can also shift out the catalyst and the additional high activated catalyst of inactivation easily, convenient and flexible operation.Yet this paste state bed reactor finds that in use the down-comer porch of this paste state bed reactor is stopped up easily, has influenced the operation cycle, need improve.
The utility model content
The purpose of this utility model provides a kind of slurry bed circulatory flow reactor filtration system that can prevent and stops up, and improves the downcomer structure of the slurry bed circulatory flow reactor of separative efficiency.
A kind of downcomer structure that has the slurry bed circulatory flow reactor in magnetic field, form by down-comer cylinder 1, turbination upper isolation plate 2, lower isolation plate 6 and inner at least one screen pipe 8, screen pipe 8 inlets are opened on upper isolation plate 2, exit opening is in lower isolation plate 6, the cylinder body wall connects discharge nozzle 10, the scope of the coning angle 3 of described upper isolation plate is 20 °-70 °, and solenoid is twined in order to uniform magnetic field to be provided in the outside of down-comer.
The downcomer structure of the slurry bed circulatory flow reactor that the utility model provides, inside comprise at least one screen pipe 8, and when adopting many screen pipes, the diameter of screen pipe can be identical, also can be different, and the diameter maximum of preferred inverted cone-shaped structure bottom screen pipe.As Fig. 2, shown in Figure 3 be exactly the schematic diagram of the downcomer structure formed of two kinds of multi-form screen pipes.
The slurry bed circulatory flow reactor downcomer structure that the utility model provides, the decanting zone of described cylinder 1 top and paste state bed reactor is connected, the top of cylinder 1 is provided with straight length 4 between the upper isolation plate that is provided with the screen pipe inlet, the height of straight length 4 is (0.1-20) with its diameter than scope: 1, preferred (2-10): 1.
The paste state bed reactor downcomer structure that the utility model provides, the arrival end of described screen pipe adopts the flow-guiding structure 2 of back taper, coning angle 3 angular ranges of inverted cone-shaped structure are 20 °-70 °, and in use, described coning angle 3 should be greater than the angle of repose of solid particle.
In the paste state bed reactor downcomer structure that the utility model provides, by the down-comer cylinder, go up division board, the closed area that surrounds of division board and screen pipe outer wall is the filtrate district 7 that holds filtrate down, the filtrate district is connected by being arranged on liquid outlet opening 10 on the down-comer cylinder and follow-up pipeline.For example, liquid outlet opening 10 connects the fluid product collector unit through valve 11, connects the backwashing system that is used for the washing and filtering element through valve 12 simultaneously.
Comprise at least one screen pipe in the slurry bed circulatory flow reactor down-comer that the utility model provides, to the material of screen pipe without limits, the material of described screen pipe is sintered metal mesh micropore filter material, sintering metal powder micropore filter material, metal micro-holes membrane material, sintered metal fiber poromerics, micropore ceramics material, ceramic membrane material.The pore diameter range of screen pipe filtering material can be by the scale of the kind of the catalyst granules of concrete use, reactor and the reaction type that is carried out and is changed, for example can be within filter areas such as micro-filtration, ultrafiltration, nanofiltration.
Usually in slurry bed circulatory flow reactor, in tedge, carry out gas-liquid-solid phase reaction, in down-comer, realize liquid-solid separation, in the process of device running, gradually pile up filter cake on the filter medium in the down-comer, the pressure reduction of screen pipe both sides rises along with thickening of filter cake, when pressure reduction is higher than first setting value (for example 0.1-1.0Mpa), backwashing system is started working, the fluid product discharging opening switched to the pipeline that recoils be communicated with, backwash medium liquid outlet opening under the reverse pressure reduction that adds promotes flows into oppositely breaks through filter medium, constantly reduce with the reverse pressure reduction of removing of filter cake, when being lower than second setting value (for example 0.05-0.8Mpa), flushing process finishes, the valve closing before the pipeline that recoils this moment, the liquid outlet opening pipeline returns to normal operating state again.Wherein first setting value must be greater than second setting value.
The downcomer structure that the utility model provides in use, slurries from top to bottom flow in screen pipe 8 vertically, clear liquid radially enters filtrate district 7 by the screen pipe tube wall from inside to outside, and finally draws through liquid outlet opening pipeline 10 as product.Solid particle then continues to flow to the downstream downwards with the slurries main body.Adopt the method for this cross-flow filtration, slurries constantly wash away the filter cake that is deposited on the screen pipe inwall, the formation speed of the filter cake that slowed down.Because the inlet of the screen pipe in the down-comer has adopted inverted cone-shaped structure, and the design cone angle stops up screen pipe greater than the angle of repose of solid particle thereby effectively avoided solid phase particles to deposit at the screen pipe arrival end.In addition, around the described down-comer cylinder close around the current-carrying solenoid uniform magnetic field is provided, when the magnetic retention particle in the slurries passes through, can be subjected to the magnetic field force effect identical with flow direction, thereby quicken to pass through filter assemblies, also avoided the deposition of magnetic retention particle, and suppressed the filter cake generation in the chimney filter porch.Improve separative efficiency by this dual mode, prolonged the work period of down-comer filter assemblies.
The downcomer structure of the slurry bed circulatory flow reactor that the utility model provides is specially adapted to disclosed slurry bed circulatory flow reactor among the CN101081357A.Be applicable to that gas-liquid-solid phase reaction and the chemical reaction process, particularly solid catalyst particle that need isolate fluid product from slurries have the course of reaction of magnetic (or part has magnetic).
The beneficial effect of the slurry bed circulatory flow reactor downcomer structure that the utility model provides is:
In application process, because the inlet of the screen pipe in the down-comer has adopted inverted cone-shaped structure, and the design cone angle stops up screen pipe greater than the angle of repose of solid particle thereby effectively avoided solid phase particles to deposit at the screen pipe arrival end.In addition, around the described down-comer cylinder close around solenoid uniform magnetic field is provided, when the magnetic retention particle in the slurries passes through, can be subjected to the magnetic field force effect identical with flow direction, thereby quicken to pass through filter assemblies, also avoided the deposition of magnetic retention particle in the chimney filter porch, the magnetic-particle in the inhibition slurries has improved separative efficiency to the obstruction of screen pipe tube wall fenestra by this dual mode, has prolonged the work period of down-comer filter assemblies.
Description of drawings
Fig. 1 is the slurry bed circulatory flow reactor downcomer structure schematic diagram that has magnetic field;
Fig. 2 is the stereogram of the inner many screen pipe structures of down-comer;
Fig. 3 is another kind of downcomer structure stereogram;
Fig. 4 is the slurry bed circulatory flow reactor schematic diagram that comprises two downcomer structures.
The specific embodiment
Specify the application of slurry bed circulatory flow reactor downcomer structure in the Fischer-Tropsch building-up process that the utility model provides below in conjunction with accompanying drawing, but therefore the utility model is not restricted.
As shown in Figure 1: the tedge 9 of slurry bed circulatory flow reactor is a reaction zone, reactant gas enters reactor after gas distributor is uniform mixes with wherein slurries from the bottom of tedge 9, contact with catalyst granules in the slurries, finish chemical reaction in uphill process, product and unnecessary reactant rise to reactor top with catalyst; The slurries overflow of carrying bubble secretly flows into decanting zone, tedge top 16, slurry flow rate reduces herein, bubble is removed in a large number, the bubble of deviating from is discharged from gas vent 17 with gas form, the slurries of carrying catalyst granules secretly then enter in the down-comer through pipeline 18, slurries flow in screen pipe 8 from the top down, and fluid product radially enters filtrate district 7 by the screen pipe tube wall, finally draws as fluid product.Catalyst granules then is arrested on the inwall of screen pipe 8, part filter cake on the screen pipe inwall is constantly washed away by slurries and comes off, solenoid 19 energisings simultaneously provide the high strength uniform magnetic field, when the magnetic retention particle in the slurries passes through, be subjected to the magnetic field force effect identical with flow direction, thereby quicken by filter assemblies, flowing downward with slurries turns back in the tedge 9, and the filter cake of part difficult drop-off can be trapped on the inwall of screen pipe.Along with constantly thickening of filter cake, the pressure reduction between screen pipe is inside and outside rises, and when pressure reduction was higher than 0.5MPa, the valve 11 that connects liquid outlet opening 10 cut out, and valve 12 is opened, and backwashing system is started working.Sprung back in the slurries attached to the filter cake on the filter medium inwall, and return tedge along with slurries flow downward, the pressure reduction between screen pipe is inside and outside descends, and when the pressure reduction of inner and outer pipes was lower than 0.1MPa, system returned to normal operating state.
The slurry bed circulatory flow reactor that has two down-comers sees that 4, two down-comers of accompanying drawing have same filtration, and in the process of using, two down-comers can use simultaneously, also can alternately switch use.Equally, the backwash process of membrane filtration module can carry out simultaneously in two down-comers, also can alternating individually carry out.
The following examples illustrate further the method that the utility model provides, but therefore do not limit the utility model.
Embodiment
Down-comer top straight length caliber ratio is 5: 1 in the slurry bed circulatory flow reactor, the screen pipe that is adopted is the sintered porous metal chimney filter, and filter assemblies slurries porch inverted cone-shaped structure cone angle is 45 °, this chimney filter external diameter 50mm, long 1000mm, average pore size 1 μ m.The particle size range of the catalyst that is adopted is 1~100 μ m, and synthesis gas enters bed by dicyclo pipe gas distributor with the form of bubbling by tedge bottom in this process, under operating condition, generates liquid hydrocarbon.Unreacted synthesis gas separates with slurries fully with gas products after slurries rise the decanting zone that enters into top, and is discharged by exhaust outlet; Slurries then enter in the down-comer, and clear liquid enters the filtrate district by the screen pipe tube wall and finally draws as product.Catalyst granules then is arrested on the inwall of screen pipe, and the part filter cake on the screen pipe inwall is constantly washed away by slurries and comes off, and flowing downward with slurries turns back in the tedge, and the filter cake of part difficult drop-off can be trapped on the inwall of screen pipe.Along with constantly thickening of filter cake, the pressure reduction between screen pipe is inside and outside rises, and when pressure reduction was higher than 0.5MPa, the valve 11 that is positioned at behind the liquid discharge gate 10 cut out, and valve 12 is opened, and with pump the product clear liquid is introduced filtrate district, and enters in the chimney filter by the filtration tube wall and to manage.Sprung back in the slurries attached to the filter cake on the filter medium inwall, and, slurries return tedge along with flowing downward, this process continues several seconds, pressure reduction between screen pipe is inside and outside descends, when the pressure reduction of inner and outer pipes is lower than 0.1MPa, backwashing system and liquid discharge gate 10 disconnect, and valve 11 is opened, and system returns to normal operating state.In this process, the content of solid particle is less than 5 μ g/ml in the liquid form product, and the maximum gauge of particle is 2 μ m.Separative efficiency is more than 99%.Wherein separative efficiency is calculated by following formula:
η=(S
m-S
f)/S
m
Wherein: S
mSolid content in the=raw material (slurries before filtering); S
fSolid content in the=product (clear liquid that draw in the filtrate district).
Claims (5)
1. downcomer structure that has the slurry bed circulatory flow reactor in magnetic field, it is characterized in that forming by down-comer cylinder (1), turbination upper isolation plate (2), lower isolation plate (6) and inner at least one screen pipe (8), screen pipe (8) inlet is opened on upper isolation plate (2), exit opening is in lower isolation plate (6), the cylinder body wall connects discharge nozzle (10), the scope of the coning angle of described upper isolation plate (3) is 20 °-70 °, and solenoid is twined in order to uniform magnetic field to be provided in the outside of down-comer.
2. according to the downcomer structure of the paste state bed reactor of claim 1, it is characterized in that described screen pipe (8) is two when above, the diameter of inverted cone-shaped structure bottom screen pipe is greater than the screen pipe diameter that is opened on the conical surface.
3. according to the downcomer structure of the paste state bed reactor of claim 1, the material that it is characterized in that described screen pipe (4) is sintered metal mesh micropore filter material, sintering metal powder micropore filter material, metal micro-holes membrane material, sintered metal fiber poromerics, micropore ceramics material or ceramic membrane material.
4. slurry bed circulatory flow reactor, constitute by tedge and at least one down-comer, tedge top is the gas-liquid separation zone that caliber enlarges, the top of down-comer and gas-liquid separation zone are communicated with, down-comer bottom and tedge bottom are communicated with, it is characterized in that described down-comer has the structure of claim 1, wherein by screen pipe outer wall and down-comer cylinder inwall and up and down division board surround the filtrate district, the filtrate district connects the fluid product discharging opening.
5. according to the slurry bed circulatory flow reactor of claim 4, it is characterized in that described circulation flow reactor is made of a tedge and two down-comers.
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CN2009202203607U CN201776135U (en) | 2009-10-29 | 2009-10-29 | Structure of descending pipe with magnetic field for slurry bed circulation flow reactor |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103747861A (en) * | 2011-06-24 | 2014-04-23 | 安格斯化学公司 | Process and apparatus for production and filtration of aminoalcohols using a continuous stirred tank slurry reactor |
CN111764850A (en) * | 2020-06-22 | 2020-10-13 | 中国石油大学(北京) | Hollow ball filtering and separating device and drilling string |
-
2009
- 2009-10-29 CN CN2009202203607U patent/CN201776135U/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103747861A (en) * | 2011-06-24 | 2014-04-23 | 安格斯化学公司 | Process and apparatus for production and filtration of aminoalcohols using a continuous stirred tank slurry reactor |
CN111764850A (en) * | 2020-06-22 | 2020-10-13 | 中国石油大学(北京) | Hollow ball filtering and separating device and drilling string |
CN111764850B (en) * | 2020-06-22 | 2022-02-25 | 中国石油大学(北京) | Hollow ball filtering and separating device and drilling string |
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