CN201529521U - Slurry bed circulating reactor downcomer structure of coupled magnetic field - Google Patents
Slurry bed circulating reactor downcomer structure of coupled magnetic field Download PDFInfo
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- CN201529521U CN201529521U CN2009202203630U CN200920220363U CN201529521U CN 201529521 U CN201529521 U CN 201529521U CN 2009202203630 U CN2009202203630 U CN 2009202203630U CN 200920220363 U CN200920220363 U CN 200920220363U CN 201529521 U CN201529521 U CN 201529521U
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- slurry bed
- filter
- flow reactor
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Abstract
A slurry bed circulating reactor downcomer structure of a coupled magnetic field comprises a downcomer cylinder body (1), an upper isolation plate (6), a lower isolation plate (5) and at least two filter pipes (2) arranged inside the cylinder body, the upper end of the filter pipe (2) is provided with an inverted conical structure (9) with a cone angle of 20 degrees-70 degrees, the upper port of the filter pipe (2) is arranged on the upper isolation plate (6), and the lower port thereof is arranged on the lower isolation plate (5), a region surrounded by the inner wall of the cylinder body (1), the outer wall of the filter pipe (2) and the upper and the lower isolation plates is a liquid filter region (3), the lower portion of the liquid filtering region (3) is connected with a liquid discharge port (8), and the periphery of the downcomer cylinder body (1) is surrounded by current-carrying spiral coils (9) densely for providing even magnetic field. The downcomer structure provided by the utility model can prevent solid granules from stacking the inlet of a downcomer and blocking the filter pipe, can accelerate the passing speed of catalyst granules through the filter pipe when magnetic catalyst granules are adopted, inhibits filter cakes forming on the wall of the filter pipe, and prolongs the work cycle.
Description
Technical field
The utility model relates to a kind of with the isolated equipment of small solid particle in the slurries, more particularly, relates to the filter assemblies of separating liquid product and solid particle in a kind of gas-liquid-solid three-phase slurry bed circulatory flow reactor.
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.
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 ofly can be avoided or reduce the slurry bed circulatory flow reactor filtration system and stop up, and improves the downcomer structure of the slurry bed circulatory flow reactor of separative efficiency.
A kind of slurry bed circulatory flow reactor downcomer structure of coupled magnetic field, it is characterized in that by down-comer cylinder 1, last division board 6, following division board 5 is formed with two screen pipes 2 that are installed on inner barrel at least, the upper end of screen pipe 2 is an inverted cone-shaped structure 9, the scope of coning angle 13 is 20 °～70 °, screen pipe 2 upper end open are in last division board 6, lower ending opening is in following division board 5, described cylinder inwall, screen pipe outer wall and the zone that surrounds between the division board up and down are filtrate district 3,3 bottoms, filtrate district connect liquid outlet opening 8, around the described down-comer cylinder 1 close around current-carrying solenoid 19 in order to uniform magnetic field to be provided.
The slurry bed circulatory flow reactor downcomer structure that the utility model provides, the decanting zone of described cylinder top 11 and slurry bed circulatory flow reactor is connected, cylinder top 11 is provided with straight length 4 between the last division board 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 slurry bed circulatory flow reactor downcomer structure that the utility model provides, the arrival end of described screen pipe adopts the flow-guiding structure 9 of back taper, coning angle 13 angular ranges of inverted cone-shaped structure are 20 °～70 °, and in use, described coning angle 13 should be greater than the angle of repose of solid particle.Preferred a kind of structure is, the gap between the screen pipe inlet also is provided with water conservancy diversion vertebra 14 on the division board 6 on described, and the lower edge of water conservancy diversion vertebra 14 and chimney filter enter the mouth that the upper limb of pyramidal structure 9 coincides or be parallel.
In the slurry bed circulatory flow 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 3 that holds filtrate down, the filtrate district is connected by being arranged on liquid outlet opening 8 on the down-comer cylinder and follow-up pipeline.For example, liquid outlet opening 8 connects the fluid product collector unit through valve 10, connects the backwashing system that is used for the washing and filtering element through valve 7 simultaneously.
Comprise at least two screen pipes 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 or 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 slurries district 2 vertically, slurries can radially enter filtrate district 3 by the screen pipe tube wall from inside to outside from screen pipe inside when flowing through described screen pipe, and finally draw through liquid outlet opening pipeline 8 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 gas-liquid-solid phase reaction and need from slurries, isolate the chemical reaction process of fluid product, particularly solid catalyst particle has magnetic (or part has magnetic), as adopting hydrocarbon oil hydrogenation, certain embodiments and the Fischer-Tropsch building-up process of suspension bed or paste state bed reactor.
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 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.On the division board water conservancy diversion vertebra being set on the down-comer inlet, can reduce the flow resistance of slurries, strengthened the uniformity of distribution of slurry in each screen pipe.
Description of drawings
Fig. 1 is the downcomer structure schematic diagram of the slurry bed circulatory flow reactor of magnetic field coupling;
Fig. 2 is the last division board vertical view that has the downcomer structure of 7 screen pipes;
Fig. 3 is provided with the schematic diagram of water conservancy diversion vertebra for three screen pipe inlet gaps on the last division board;
Fig. 4 is applied to the schematic flow sheet of slurry bed circulatory flow reactor for the downcomer structure of magnetic field coupling.
The specific embodiment
The filter assemblies that specifies the utility model and provide below in conjunction with accompanying drawing is used for the continuous separation method of synthetic slurry bed circulatory flow reactor liquid of Fischer-Tropsch and solid particle, but therefore the utility model is not restricted.
As shown in Figure 4: the tedge 15 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 15, contact with catalyst granules in the slurries, in uphill process, finish chemical reaction, product and unnecessary reactant rise to decanting zone, tedge top 16 with catalyst, 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 down-comer direct current section 4 through pipeline 18, and slurries enter each screen pipe 2 by inverted cone-shaped structure 9 again after water conservancy diversion vertebra flow guide distribution; Slurries flow in screen pipe from the top down, and clear liquid radially enters filtrate district 3 by the screen pipe tube wall simultaneously, draw as fluid product through liquid outlet opening 8.Catalyst granules then is arrested on the inwall of screen pipe 2, 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 15.The filter cake of part difficult drop-off can be trapped on the inwall of screen pipe, and along with constantly thickening of filter cake, the pressure reduction of screen pipe tube wall both sides rises.When pressure reduction is higher than 0.5MPa, the valve 7 that connects liquid outlet opening 8 is opened, backwashing system is started working, filter cake is sprung back over to flow downward in the slurries returns tedge, the pressure reduction of screen pipe tube wall both sides descends, and when pressure reduction was lower than 0.1MPa, valve 7 was closed, valve 10 is opened, and system returns to normal operating state.
The following examples illustrate further the utility model, 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, comprise 7 screen pipes in the down-comer, the chimney filter external diameter is 50mm, and the screen pipe material is the sintered porous metal chimney filter, average pore size is 1 μ m, and screen pipe slurries porch inverted cone-shaped structure cone angle is 45 °.The particle size range of the catalyst that is adopted is 1～100 μ m.
Synthesis gas enters bed by dicyclo pipe gas distributor with the form of bubbling by tedge bottom, 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 10 that is positioned at behind the liquid discharge gate 8 cut out, and valve 7 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 8 disconnect, and valve 10 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 η is calculated by following formula:
η＝(S
m-S
f)/S
m
Wherein: S
mSolid content before the=filtration in the slurries; S
fSolid content in the clear liquid that draw in=filtrate district.
Claims (5)
1. the slurry bed circulatory flow reactor downcomer structure of a coupled magnetic field, it is characterized in that by down-comer cylinder (1), last division board (6), following division board (5) and at least two screen pipes (2) that are installed on inner barrel are formed, the upper end of screen pipe (2) is inverted cone-shaped structure (9), the scope of coning angle (13) is 20 °～70 °, screen pipe (2) upper end open is in last division board (6), lower ending opening is in following division board (5), described cylinder (1) inwall, screen pipe (2) outer wall and up and down the zone that surrounds of division board be filtrate district (3), bottom, filtrate district (3) connects liquid outlet opening (8), around the described down-comer cylinder (1) close around current-carrying solenoid (19) in order to uniform magnetic field to be provided.
2. according to the slurry bed circulatory flow reactor downcomer structure of claim 1, the decanting zone of described cylinder top (11) and slurry bed circulatory flow reactor is connected, cylinder top (11) is provided with straight length (4) between the last division board that is provided with the screen pipe inlet, the height of straight length (4) is (0.1-20) with its diameter ratio: 1.
3. according to the slurry bed circulatory flow reactor downcomer structure of claim 2, the height of described straight length (4) is (2-10) with its diameter ratio: 1.
4. according to the slurry bed circulatory flow reactor downcomer structure of claim 1, the gap on the described upper isolation plate between the screen pipe inlet also is provided with water conservancy diversion vertebra (14).
5. according to the slurry bed circulatory flow reactor downcomer structure of claim 1, the material that it is characterized in that 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 or ceramic membrane material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202203630U CN201529521U (en) | 2009-10-29 | 2009-10-29 | Slurry bed circulating reactor downcomer structure of coupled magnetic field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202203630U CN201529521U (en) | 2009-10-29 | 2009-10-29 | Slurry bed circulating reactor downcomer structure of coupled magnetic field |
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| Publication Number | Publication Date |
|---|---|
| CN201529521U true CN201529521U (en) | 2010-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009202203630U Expired - Lifetime CN201529521U (en) | 2009-10-29 | 2009-10-29 | Slurry bed circulating reactor downcomer structure of coupled magnetic field |
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| Country | Link |
|---|---|
| CN (1) | CN201529521U (en) |
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2009
- 2009-10-29 CN CN2009202203630U patent/CN201529521U/en not_active Expired - Lifetime
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20100721 |