CN104941535A - Improved air grille designed for oxidation or ammonia oxidation reactor - Google Patents
Improved air grille designed for oxidation or ammonia oxidation reactor Download PDFInfo
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- CN104941535A CN104941535A CN201410124984.4A CN201410124984A CN104941535A CN 104941535 A CN104941535 A CN 104941535A CN 201410124984 A CN201410124984 A CN 201410124984A CN 104941535 A CN104941535 A CN 104941535A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/1818—Feeding of the fluidising gas
- B01J8/1827—Feeding of the fluidising gas the fluidising gas being a reactant
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
- B01J8/44—Fluidisation grids
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C253/00—Preparation of carboxylic acid nitriles
- C07C253/24—Preparation of carboxylic acid nitriles by ammoxidation of hydrocarbons or substituted hydrocarbons
Abstract
When the distance between a distributor system 16 and an air grille 14 is controlled at 6-24 inches (15-61cm) and preferable 8-12 inches (20-30.5cm), insufficient reactant mixing in a commercial acrylonitrile reactor and local reactor overheating points can be remarkably reduced. In addition, the problems that the air grille moves to contact with or leave away from a supporting part and the air grille is in mechanical failure can be basically and completely eliminated by virtue of a system for attaching and connecting the air grille to the wall of the reactor and improving a supporting beam inside the air grille.
Description
Background technology
In the business of acrylonitrile manufactures, propylene, ammonia and oxygen react according to following reaction scheme one:
CH
2=CH-CH
3 + NH
3+ 3/2 O
2 → CH
2=CH-CN+ 3 H
2O
This process being commonly referred to ammoxidation is at high temperature carried out with gas phase under the existence of suitable fluid bed ammoxidation catalyst.
Fig. 1 shows the typical ammonia oxidation reactor for carrying out this process.As shown in the drawing, reactor 10 comprises reactor wall 12, air grid 14, feed distributor (sparger) 16, cooling coil 18 and cyclone (cyclone) 20.In the normal operation period, plant air is filled with in reactor 10 by air intake 22, and the mixture of propylene and ammonia is filled with in reactor 10 by feed distributor 16.Both flows are all enough high, to make bed 24 fluidisation of the ammoxidation catalyst of inside reactor, propylene and the ammonia catalytic ammoxidation to acrylonitrile occur wherein.
The product gas produced by reaction exports 26 by reactor effluent and leaves reactor 10.Before doing so, product gas is through cyclone 20, and any ammoxidation catalyst that these gases can be carried secretly removed by cyclone 20, to turn back to catalyst bed 24 by dipleg (diplegs) 25.Ammoxidation is high exothermic heat, therefore uses cooling coil 18 to take away excessive heat, thus reaction temperature is remained on proper level.
Propylene and ammonia can form explosive mixture with oxygen.But at normal operating temperatures, prevent blast in reactor 10 inside by the ammoniation catalyst of fluidisation, this catalyst is preferential catalytic ammoxidation reaction before blast can occur.Correspondingly, reactor 10 is designed to make the unique place allowing plant air to contact propylene and ammonia in the normal operation period be in the fluid bed of ammoxidation catalyst 24 with operating into, and therefore only catalyst temperature height to be enough to catalytic ammoxidation reaction time.
For this reason, traditional approach propylene and ammonia being fed to reactor 10 uses such as at U.S. 5, and 256, the feed distributor system 16 shown in 810, the disclosure of this patent is incorporated herein by reference.As shown in Fig. 1 and Fig. 2 (this two width figure is by Fig. 2 and Fig. 3 renumberd as the literature) of ' 810 patents, feed distributor 16 takes the form of a series of supply pipe or pipeline, it comprises main collector 30 and arm (lateral) 32, and arm 32 is attached to collector 30 and separates from collector 30.A series of prone feed nozzle 34 is limited in collector 30 and arm 32, and the mixture of propylene and ammonia is filled with by feed nozzle 34 during the operation of normal reaction device.The number of arm 32 and feed nozzle 34 and spacing make the whole cross-sectional area across reactor 10 be positioned with every square metre of about 10 to 30 feed nozzles altogether roughly equably.
Usually, each feed nozzle 34 is fed guard shield 36 and surrounds, and the form of the short portion section of pipeline taked by charging guard shield 36, and the internal diameter of this pipeline is the several times of nozzle 34 diameter.Charging guard shield 36 make the speed of the gas passing nozzle 34 can leave enter catalyst bed 24 before significantly slow down, this prevent the disintegration (disintegration) of original generable catalyst.
Plant air enters catalyst bed 24 (Fig. 1) usually after passing air grid 14, and air grid 14 is positioned at below feed distributor 16.As the well-known, air grid 14 takes the form of continuous print metal sheet usually, and it is limited to a series of airport wherein or nozzle.The mass flow of the diameter of air nozzle, the mass flow through the plant air of air grid 14 and the propylene/ammonia mixture through feed distributor 16, through selecting, makes the ammoxidation catalyst in catalyst bed 24 in the normal operation period by the complete fluidisation of these gases.
Airport 76 (in Figure 5) is typically provided with its oneself protective atmosphere guard shield (not shown), and this guard shield is usually located at below air grid 14.In addition, in many cases, feed nozzle 34 is arranged with one-one relationship with the air nozzle in air grid 14, wherein, each charging guard shield 36 air nozzle of directly aiming at its correspondence with promote to pass the gas of these two kinds of different spray nozzles fast and mix fully.With regard to the object of the application, such air nozzle is called as uncovered.See U.S. 4,801,731.In other cases, air nozzle can have the lid be arranged on directly over it, with preferentially along grizzly level ground (with directed or non-uniform manner) instead of face charging guard shield air distribution vertically.These lids can be the little metal caps be welded on above such air nozzle.The design that lid is attached to the leg of grid be may be selected to optimum level distribution of gas pattern.The catalyst (i) that these lids above airport also can be designed to prevent from being in anti-fluidized state is fallen by airport and/or (ii) is deposited in lid originally (such as, by having domatic or being made up of angle bar) with it.
Although the propylene of this general type/ammonia feed system is respond well, can there is some shortcoming in it.Such as, the propylene/ammonia incoming mixture passing feed distributor 16 may be insufficient with mixing of the air passing air grid 14.This can reduce reactor performance, causes reactant to the less-than-ideal conversion of product.
In addition, the molybdenum dirt (molybdenum scale) produced by ammoxidation catalyst can cause this molybdenum of rickle dirt to add that the form that the catalyst carried secretly of additional quantity is piled with little catalyst accumulates on the upper surface of air grid 14.These heap effects are similar to miniature static or " fixing " catalyst bed that wherein ammoxidation reaction continues to occur.Because the heat trnasfer of fixing catalyst bed inside is far weaker than in fluid bed, so these catalyst heap produces local hot spot, the temperature of this heat spot is high enough to damage the catalyst just arriving neighbouring any fluidisation.Such as, such temperature is high enough to the surface of calcining any fluidized catalyst near arriving, and this then reduces surface area and therefore reduces catalyst activity.Further, because each catalyst granules forming fluid catalyst beds freely cycles through its whole volume, so pass in time, these heat spots can damage all chargings of the fluid catalyst in reactor.
Other shortcoming comprises the mechanical problem of the structure of acrylonitrile reactor.Typical commercial propylene nitrile reactor operates at the temperature of the relative constancy of about 400 to 550 ° of C, but really there will be fluctuation.In addition, ammonia oxidation reactor must regularly be shut down, to carry out conventional maintenance, catalyst change etc., and due to paroxysmal fault, and such as such as power failure.Because normal running temperature is so high, when reactor changes between environment temperature and normal running temperature, the variations in temperature of inside reactor can up to 500 ° of C or more.This circulation between low temperature and high temperature can apply sizable stress on the structural elements of forming reactions device, is especially connected to place each other, because the intrinsic expansion of these structural elements and systole response occur in variations in temperature at them.Along with passage of time, these stress can cause mechanical failure, especially in the joint formed by welding.
Such as, to be attached to the normal mode of the wall 12 of reactor 10 shown in Figure 4 for air grid 14.As shown in the figure, air grid 14 is attached to the sidewall 12 of reactor by knuckle (knuckle) 44, and this air grid 14 adopts the form of the substantially smooth metallic plate 40 with a series of hole wherein.As is shown in this figure, knuckle 44 adopts the form of the concave cross section of metal on cross section, its upper end 46 substantially flushes with sidewall 12 and is welded to sidewall 12 by weld seam 48, and its lower end 50 and the edge faced by air grid plate 40 copline and be welded to this edge by weld seam 52 substantially.
In the large commercial acrylonitrile reactor of diameter 31 feet (~ 9.4 meters); such as, air grid plate 40 can flatly expand and shrink nearly inch (1.27cm) in response to the variations in temperature experienced between reactor start-up and down period.This produces very large stress on knuckle 44, and is especially being used for knuckle 44 to be attached to the weld seam 48 and 52 of air grid plate 40 and sidewall of reactor 12.Regrettably, pass in time, these stress can cause mechanical failure, and this needs again long downtime to place under repair and/or to change.
Another shortcoming be associated with above-mentioned conventional design relates to air grid and bends.Because when reactor 10 is shut down, air grid 16 must support the whole weight of the catalyst charge of reactor 10 inside, therefore need from below support air flase floor 40 to adapt to this weight.Usually, this realizes by means of the I-beam system of shelving air grid plate 40 above.In the design of some reactors, air grid plate 40 is only shelved on these I-beams.Regrettably, in the designs, air grid plate 40 has the trend trembleed in the normal operation period, and this is not only the power of the air owing to moving upwardly through this air grid plate, and due to its intrinsic expansion when its temperature is increased to normal running temperature.In other design, air grid plate 40 is welded to the top of these I-beams.Regrettably, in the designs, the power of the air moved up adds that the intrinsic expansion of air grid plate can cause the mechanical failure of these weld seams.
Summary of the invention
According to technology of the present disclosure, have been found that, when distance between sparger system 16 and air grid 14 is controlled in 6 to 24 inches (~ 15 to ~ 61cm), preferably 8 to 12 inches (~ 20 to ~ 30.5cm), the problems referred to above of reactant undercompounding and local reaction device heat spot can alleviate significantly.In addition, also found out that, the problems referred to above of air grid vibration and air grid mechanical failure can substantially fully be eliminated by means of the system of the improvement for air grid being attached to the wall of reactor and the brace summer of its inside.
Therefore, the disclosure provides a kind of feed system for the commercialization oxidation of such as acrylonitrile reactor or the improvement of ammonia oxidation reactor according to a feature, it comprises: feed distributor, and it is for being supplied to the inside of reactor by the mixture of undersaturated and/or saturated C3 to C4 hydrocarbon and ammonia; and air grid system, it is for supplying air to the inside of reactor, feed distributor comprises main header tube and fluid is attached to main header tube and the pipeline separated from main header tube, main header tube and a pipeline all limit prone feed nozzle, feed distributor system also comprises the charging guard shield be associated with corresponding feed nozzle, each charging guard shield comprises near-end, this near-end is connected to corresponding pipeline or header tube and is arranged to C3 to the C4 hydrocarbon and ammonia that pass its corresponding feed nozzle to lead downwards enter the inside of reactor, air grid system comprises the continuous metal sheet of the below being arranged in feed distributor system, continuous metal sheet is limited to a series of airports wherein for top plant air being directed to continuous metal sheet from the below of continuous metal sheet towards sparger system, distance wherein between the upper surface and the far-end of charging guard shield of continuous metal sheet is selected as between about 6 to 24 inches (~ 15 to ~ 61cm).As used herein, the mixture of undersaturated and/or saturated C3 to C4 hydrocarbon refers to C3 to the C4 hydrocarbon comprising propane, propylene, butane, butylene and their mixture.
On the other hand, provide a kind of for being oxidation or the method for ammonia oxidation reactor feed, it comprises the inside saturated and/or undersaturated C3 to C4 hydrocarbon and ammonia mixture being supplied to reactor by feed distributor.Feed distributor comprises main header tube and fluid is attached to main header tube and the pipeline separated from main header tube, and main header tube and a pipeline all limit prone feed nozzle.Feed distributor system also comprises the charging guard shield be associated with corresponding feed nozzle, each charging guard shield comprises near-end, and this near-end is connected to corresponding pipeline or header tube and is arranged to lead downwards enter the inside of acrylonitrile reactor by passing the saturated of its corresponding feed nozzle and/or undersaturated C3 to C4 hydrocarbon and ammonia.The method also to comprise air by air grid system supply to the inside of reactor.Air grid system comprises the continuous metal sheet of the below being arranged in feed distributor system, and continuous metal sheet is limited to a series of airports wherein for top plant air being directed to continuous metal sheet from the below of continuous metal sheet towards sparger system.On the one hand, the distance between the upper surface and the far-end of charging guard shield of continuous metal sheet is between about 6 to about 24 inches (about 15 to about 61cm).
In addition, the disclosure is according to the air grid system that another feature provides a kind of improvement for using in the commercialization oxidation or ammonia oxidation reactor of such as acrylonitrile reactor, the air grid system of this improvement comprises: continuous metal sheet, its periphery limiting upper surface, lower surface and extend between upper surface and lower surface, this continuous metal sheet also limits a series of airport and leads towards the distributor feed system be positioned at above continuous metal sheet below continuous metal sheet for by plant air, and support system, it is for the weight supporting continuous metal sheet and can be shelved on any oxidation on continuous metal sheet or ammoxidation catalyst, wherein support system comprises a series of brace summer and is attached to a series of support member pressing elements (hold-downs) of downside of continuous metal sheet regularly, each brace summer has the upper stayed surface of the downside of joint continuity metallic plate, each support member pressing element is arranged to be bonded on as follows in corresponding brace summer the matching surface be limited to below its upper surface, namely support member pressing element is made to prevent continuous metal sheet to be lifted away from into series of support beam.
On the other hand, a kind of method of the movement for reducing the air grid system in commercial oxidation or ammonia oxidation reactor is provided.The method comprises provides air grid system, and this air grid system comprises: continuous metal sheet, its periphery limiting upper surface, lower surface and extend between upper surface and lower surface.This continuous metal sheet is also defined for a series of airports of top plant air being directed to continuous metal sheet from the below of continuous metal sheet; And support system, it is for the weight supporting continuous metal sheet and can be shelved on any oxidation on continuous metal sheet or ammoxidation catalyst.On the one hand, the support system upper surface-supported one-tenth series of support beam that comprises the downside all with joint continuity metallic plate be attached to regularly continuous metal sheet downside become series of upright supports pressing element.Each support member pressing element is arranged to be bonded on as follows in corresponding brace summer the matching surface be limited to below its upper surface, namely makes support member pressing element prevent continuous metal sheet to be lifted away from into series of support beam.
In addition, the disclosure is according to the air grid system that another feature provides a kind of improvement for using in the commercialization oxidation or ammonia oxidation reactor of such as acrylonitrile reactor, the air grid system of this improvement comprises: continuous metal sheet, its periphery limiting upper surface, lower surface and extend between upper surface and lower surface, this continuous metal sheet also limits a series of airport and leads towards the distributor feed system be positioned at above continuous metal sheet for by the below of plant air from continuous metal sheet, and coupling assembling, it is for being attached to the sidewall of oxidation or ammonia oxidation reactor by the periphery of continuous metal sheet, wherein coupling assembling comprises the dividing plate of flex plate and cooperation, flex plate and dividing plate comprise the endless metal sheet material limiting top and bottom separately, flex plate and dividing plate be all arranged to be oxidized or ammonia oxidation reactor sidewall substantially consistent (congruent), its median septum is attached to the sidewall of oxidation or ammonia oxidation reactor, wherein the bottom attachment of flex plate is to the periphery of continuous metal sheet, and the mode of bottom that wherein flex plate extends with the bottom part down making flex plate and be limited to dividing plate is attached to dividing plate, deviation in the diameter of the continuous metal sheet caused with the variations in temperature made because of inside reactor adapts to by making the bottom of flex plate bend.
On the other hand, provide a kind of method for adapting to the flexure in air grid system, the method comprises provides continuous metal sheet, the periphery that this continuous metal sheet limits upper surface, lower surface and extends between upper surface and lower surface.Continuous metal sheet also limits a series of airport for top plant air being directed to continuous metal sheet from the below of continuous metal sheet, and for the coupling assembling of the sidewall that the periphery of continuous metal sheet is attached to reactor.Coupling assembling comprises the dividing plate of flex plate and cooperation, and flex plate and dividing plate comprise the endless metal sheet material limiting top and bottom separately.Flex plate and dividing plate are all arranged to substantially consistent with the sidewall of reactor, its median septum is attached to the sidewall of reactor, wherein the bottom attachment of flex plate is to the periphery of continuous metal sheet, and the mode of bottom that wherein flex plate extends with the bottom part down making flex plate and be limited to dividing plate is attached to dividing plate, and the deviation diametrically of the continuous metal sheet caused with the variations in temperature made because of acrylonitrile inside adapts to by making the bottom of flex plate bend.
Accompanying drawing explanation
Fig. 1 is schematic diagram, it illustrates the reactor section section of the conventional ammonia oxidation reactor for the preparation of acrylonitrile;
Fig. 2 is plane, it illustrates the downside of the conventional sparger system of the ammonia oxidation reactor of Fig. 1;
Fig. 3 is the sectional view intercepted along the line 3-3 of Fig. 2, the feed nozzle that Fig. 3 shows the conventional sparger system of Fig. 2 and the charging guard shield be associated;
Fig. 4 illustrates the usual manner of the wall air grid of acrylonitrile reactor being attached to reactor;
Fig. 5 is the partial sectional view of acrylonitrile reactor, it illustrates fisrt feature of the present disclosure, wherein by air grid and feed distributor being spaced apart from each other suitable distance and improve the performance of conventional acrylonitrile reactor, and reduce the mechanical failure of some parts to acrylonitrile reactor;
Fig. 6 illustrates second feature of the present disclosure, which provides the novel support system of the air grid for supporting acrylonitrile reactor; And
Fig. 7 illustrates third feature of the present disclosure, which provides the unique coupling assembling for the air grid 14 of acrylonitrile reactor being fixed to the sidewall of reactor.
Detailed description of the invention
Fig. 5 shows the fisrt feature of technology of the present disclosure, wherein air grid 14 and the spaced apart suitable distance of feed distributor 16,6 to 24 inches especially (~ 15 to ~ 61cm).Specifically, as shown in the figure, feed distributor 16 comprises multiple charging guard shield 60, and each charging guard shield is associated to the corresponding feed nozzle be limited in the collector 30 of sparger system or arm 32.Each charging guard shield limit the near-end 62 that is connected to its corresponding collector 30 or arm 32 and from its away from far-end 64, wherein charging guard shield 60 be arranged to by pass the propylene of its corresponding feed nozzle and ammonia charging towards air grid 14 downwards guiding enter the inside of acrylonitrile reactor.Simultaneously, air grid 14 adopts the form of continuous metal sheet 70, continuous metal sheet 70 to be arranged in below feed distributor 16 and a series of airports 76 limiting upper surface 72, lower surface 74 and extend between upper surface 72 and lower surface 74, for upwards being led towards feed distributor 16 by the plant air entering ammonia oxidation reactor below continuous metal sheet.
According to this feature of the present invention, the far-end 64 of charging guard shield 60 is arranged at the distance of the upper surface 72 from continuous metal sheet 70 (~ 15 to ~ 61cm) place that is 6 to 24 inches.Preferably, the far-end 64 of charging guard shield 60 is arranged at the distance of the upper surface 72 from continuous metal sheet 70 (~ 20 to ~ 30.5cm) place that is 8 to 12 inches.According to this feature of the present disclosure, found out that, not only mix by insufficient reactant the poor reactor performance caused greatly to eliminate by following the method, and the damage of ammoxidation catalyst and the other problem that caused by local reaction device heat spot are also eliminated by following the method or at least roughly reduced.
From theory/conceptual point, seem it is beneficial that to be minimized in the distance between air grid 14 and feed distributor 16, because this seems to contribute to the mixing passing the maximum possible degree between the feeding gas of distributor 16 and the plant air passing air grid 16.But, find in practice, air grid 14 is arranged too close feed distributor 16 contributes to forming reactions device heat spot, as mentioned above.When the distance between air grid 14 and feed distributor 16 is too little, some airports 76 in continuous metal sheet 70 or the far-end 64 of charging guard shield 60 or both become the catalyst/molybdenum dirt heap being positioned at and being deposited in inherently on the upper surface 72 of continuous metal sheet 70.This causes propylene, ammonia and air reactant to contact with each other in these catalyst heap inside, and the behavior of catalyst heap is similar to the poor and therefore fixing catalyst bed that raises rapidly of temperature of wherein heat trnasfer.Correspondingly, the distance between air grid 14 and feed distributor 16 measured between the far-end 64 and the upper surface 72 of continuous metal sheet of charging guard shield 60 should be at least 6 inches (~ 15cm) and preferably at least about 8 inches (~ 20cm), to avoid this problem.
With regard to the ultimate range between air grid 14 and feed distributor 16, it has been found that, be greater than the distance of about 24 inches (~ 61cm), a part for catalyst in reactor, part particularly between air grid 14 and feed distributor 16, not can be effectively used in reaction.It reduce the conversion to product acrylonitrile of propylene and ammonia react thing, this is obviously disadvantageous.Correspondingly, the ultimate range between air grid 14 and feed distributor 16 measured between the far-end 64 and the upper surface 72 of continuous metal sheet 70 of charging guard shield 60 remains on and is no more than about 24 inches (~ 61cm), is no more than 14 inches (~ 35.5cm) preferably no more than 18 inches (~ 45.7cm), on the other hand and is no more than on the other hand 12 inches (~ 30.5cm), and to prevent, this thing happens.
Fig. 6 shows the second feature of technology of the present disclosure, which provide the novel support system that substantially represents with 80 for the weight of the continuous metal sheet 70 of support air grid 14, comprise the weight of any ammoxidation catalyst that can be shelved on this continuous metal sheet.As is shown in this figure, support system 80 adopts the form of a series of brace summer 82, and this brace summer is shown as conventional I-beam in a particular embodiment.Each I-beam 82 comprises top transverse part section 84, and it limits the upper surface 86 shelving continuous metal sheet 70 thereon.In addition, the downside of each top transverse part section 84 limits matching surface 88, engages, as discussed further below for the support member pressing element that the continuous metal sheet 70 by air grid 14 carries.
As further shown in Figure 6, a series of support bars 90 are welded to the downside of continuous metal sheet 70, and each end of support bar limits protuberance (nose) 92.As further shown in the drawings, each protuberance 92 extends in the downside of the top transverse part section 84 of corresponding I-beam 82, there, and protuberance 92 engaged fit surface 88.Utilize this structure, each support bar 90 plays the effect of pressing element, for making continuous metal sheet 70 keep in touch with the upper surface 86 of I-beam 82, thus this continuous metal sheet is prevented to be lifted away from these I-beams owing to upwards flowing through the power of the plant air of the airport 76 in this metallic plate.
As further shown in Figure 6; between part, suitable space 94 and 96 is furnished with, for adapting to owing to starting and the variations in temperature of inside reactor experience and the change in the length of these support bars that occurs inherently between down period at the end of each support bar 90 and I-beam 82.
Utilize this structure, engage the corresponding matching surface 88 of I-beam 82 by the protuberance 92 of support bar 90 and continuous metal sheet 70 is pressed on the upper surface 86 of I-beam securely.Be appreciated that other structure of the attachment means providing similar can replace support bar 90 and its protuberance 92 be associated to use.Under any circumstance; owing to being arranged in the space 94 and 96 between part of the end of each support bar 90 and I-beam 82, as starting and the result of the remarkable variations in temperature that reactor 10 inside occurs and the change in the length of support bar 90 that occurs easily is adapted to by these spaces between down period.Therefore, the mechanical failure of support system 80 is eliminated greatly.
Fig. 7 shows the third feature of technology of the present disclosure, which provides unique coupling assembling is fixed to reactor 10 sidewall 12 for the periphery of the continuous metal sheet 70 by air grid 14.As is shown in this figure, the dividing plate 104 that this coupling assembling substantially represented with 100 comprises flex plate 102 and coordinates.Flex plate 102 comprises elongated metal sheet, and its two ends weld together, to make flex plate 102 present annular shape, and the particularly right part section shape of cylindricality.Utilize this shape, flex plate 102 is substantially consistent with the sidewall 12 of the reactor 10 linked appended by air grid 14, because the middle part of reactor 10 is also configured as cylindrical form.Similarly, dividing plate 104 also comprises elongated metal sheet, and its two ends weld together, and also presents annular shape to make dividing plate 104.
As in the figure 7 further shown in, dividing plate 104 is arranged between the sidewall 12 of flex plate 102 and reactor 10, makes flex plate 102 be limited to the bottom 114 extended below the bottom 112 of dividing plate 104.Preferably, the bottom 110 of flex plate 102 extends the distance of about 6 to about 10 inches (about 15 to about 25cm), more desirably about 7 to about 9 inches (about 18 to about 23cm) below the bottom 112 of dividing plate 104.
As further shown in Figure 7, the bottom 110 of flex plate 102 is preferably by the periphery of weld attachment to the continuous metal sheet 70 of air grid 14.Utilize this structure; occur in the change in the diameter of the continuous metal sheet 70 of air grid 14 easily to be adapted to by the flexure of the bottom 114 (that is, the part of the flex plate 102 extended below the bottom 112 of dividing plate 104) of flex plate 102 due to the marked change in the temperature that reactor 10 inside between startup and down period occurs.Therefore, the mechanical failure periphery of the continuous metal sheet 70 of air grid 14 being connected to the joint of the sidewall 12 of reactor 10 is eliminated greatly.
Various aspects described herein, the aspect more specifically shown in Fig. 4-7, can be used for the reactor with various sizes diameter.In preferred, reactor can have from about 5 to about 12 meters, about 8 to about 12 meters and the external diameter of about 9 to about 11 meters on the other hand on the other hand.In a further advantageous embodiment, when being used in the reactor external diameter between about 8 to about 12 meters or about 9 to about 11 meters, air nozzle is uncovered, and air is introduced in reactor vertically, most preferably leads towards charging guard shield vertically.In an alternative embodiment, when being used in the reactor external diameter between about 8 to about 12 meters or about 9 to about 11 meters, the air nozzle in air grid is with cover, and air preferentially tegmentum is flatly distributed in reactor.
Although only describe some embodiments of technology of the present disclosure, should be appreciated that when not departing from the spirit and scope of this technology herein, can many amendments be carried out.All amendments are like this intended to be included in the scope of this technology be only limited by the appended claims.
Claims (14)
1., for a feed system for the improvement of commercialization oxidation or ammonia oxidation reactor, comprising:
Feed distributor, it is for being supplied to the inside of described reactor by saturated and/or undersaturated C3 to C4 hydrocarbon and ammonia mixture; And
Air grid system, it is for supplying air to the inside of described reactor,
Wherein, described feed distributor comprises main header tube and is fluidly attached to described main header tube and the pipeline separated from described main header tube, described main header tube and described pipeline all limit prone feed nozzle, described feed distributor system also comprises the charging guard shield be associated with corresponding feed nozzle, each charging guard shield comprises near-end, described near-end is connected to corresponding pipeline or header tube and is arranged to lead downwards enter the inside of described acrylonitrile reactor by passing the saturated of its corresponding feed nozzle and/or undersaturated C3 to C4 hydrocarbon and ammonia,
Wherein, described air grid system comprises the continuous metal sheet be arranged in below described feed distributor system, described continuous metal sheet is limited to a series of airports wherein, for plant air to be directed to the top of described continuous metal sheet from the below of described continuous metal sheet, wherein, the distance between the upper surface and the far-end of described charging guard shield of described continuous metal sheet is between about 6 to about 24 inches (about 15 to about 61cm).
2. the feed system of improvement according to claim 1, is characterized in that, described C3 to C4 hydrocarbon is selected from the group be made up of propane, propylene, butane, butylene and their mixture.
3. the feed system of improvement according to claim 1, is characterized in that, the distance between the upper surface and the far-end of described charging guard shield of described continuous metal sheet is about 8 to about 12 inches (about 20 to about 30.5cm).
4. the feed system of improvement according to claim 1, is characterized in that, the external diameter of described reactor is between about 8 to about 12 meters.
5. the feed system of improvement according to claim 4, is characterized in that, the external diameter of described reactor is between about 9 to about 11 meters.
6. the feed system of improvement according to claim 4, is characterized in that, described air nozzle is not with cover.
7. the feed system of improvement according to claim 4, is characterized in that, described air nozzle is with cover.
8., for the method for oxidation or ammonia oxidation reactor feed, comprising:
Saturated and/or undersaturated C3 to C4 hydrocarbon and ammonia mixture is supplied to the inside of described reactor by feed distributor, described feed distributor comprises main header tube and is fluidly attached to described main header tube and the pipeline separated from described main header tube, described main header tube and described pipeline all limit prone feed nozzle, described feed distributor system also comprises the charging guard shield be associated with corresponding feed nozzle, each charging guard shield comprises near-end, described near-end is connected to corresponding pipeline or header tube and is arranged to lead downwards enter the inside of described acrylonitrile reactor by passing the saturated of its corresponding feed nozzle and/or undersaturated C3 to C4 hydrocarbon and ammonia, and
Air is passed through the inside of air grid system supply to described reactor, described air grid system comprises the continuous metal sheet of the below being arranged in described feed distributor system, described continuous metal sheet is limited to a series of airports wherein, for plant air to be directed to the top of described continuous metal sheet from the below of described continuous metal sheet towards described sparger system, wherein, the distance between the upper surface and the far-end of described charging guard shield of described continuous metal sheet is about 6 to about 24 inches (about 15 to about 61cm).
9. method according to claim 8, is characterized in that, described C3 to C4 hydrocarbon is selected from the group be made up of propane, propylene, butane, butylene and their mixture.
10. method according to claim 8, is characterized in that, the distance between the upper surface and the far-end of described charging guard shield of described continuous metal sheet is about 8 to about 12 inches (about 20 to about 30.5cm).
11. methods according to claim 8, is characterized in that, the external diameter of described reactor is between about 8 to about 12 meters.
12. methods according to claim 11, is characterized in that, the external diameter of described reactor is between about 9 to about 11 meters.
13. methods according to claim 11, is characterized in that, described air nozzle is not with cover.
14. methods according to claim 11, is characterized in that, described air nozzle is with cover.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410124984.4A CN104941535A (en) | 2014-03-31 | 2014-03-31 | Improved air grille designed for oxidation or ammonia oxidation reactor |
| PCT/US2015/022190 WO2015153188A1 (en) | 2014-03-31 | 2015-03-24 | Improved air grid design for an oxidation or ammoxidation reactor |
| TW104110287A TWI658861B (en) | 2014-03-31 | 2015-03-30 | Improved air grid design for an oxidation or ammoxidation reactor |
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| CN201410124984.4A CN104941535A (en) | 2014-03-31 | 2014-03-31 | Improved air grille designed for oxidation or ammonia oxidation reactor |
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| CN201410124984.4A Pending CN104941535A (en) | 2014-03-31 | 2014-03-31 | Improved air grille designed for oxidation or ammonia oxidation reactor |
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| Country | Link |
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| CN (1) | CN104941535A (en) |
| TW (1) | TWI658861B (en) |
| WO (1) | WO2015153188A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112439368A (en) * | 2019-09-05 | 2021-03-05 | 中石油吉林化工工程有限公司 | Reactor for preparing acrylonitrile |
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| CN1060835A (en) * | 1990-10-20 | 1992-05-06 | 旭化成工业株式会社 | The manufacturing installation of α, alpha, beta-unsaturated nitriles |
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- 2015-03-24 WO PCT/US2015/022190 patent/WO2015153188A1/en active Application Filing
- 2015-03-30 TW TW104110287A patent/TWI658861B/en active
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| CN1060835A (en) * | 1990-10-20 | 1992-05-06 | 旭化成工业株式会社 | The manufacturing installation of α, alpha, beta-unsaturated nitriles |
| CN1080208A (en) * | 1992-06-25 | 1994-01-05 | 中国石油化工总公司 | The distribution device in gas-fluid of fluid-bed catalytic oxidizing reactor |
| CN1089596A (en) * | 1992-10-14 | 1994-07-20 | 标准石油公司 | Remove the method for nitrogenize in the acrylonitrile production process |
| EP0832877A2 (en) * | 1996-09-25 | 1998-04-01 | Nitto Kagaku Kogyo Kabushiki Kaisha | Ammoxidation method in fluidized-bed reactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112439368A (en) * | 2019-09-05 | 2021-03-05 | 中石油吉林化工工程有限公司 | Reactor for preparing acrylonitrile |
| CN112439368B (en) * | 2019-09-05 | 2023-11-10 | 中石油吉林化工工程有限公司 | Reactor for preparing acrylonitrile |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI658861B (en) | 2019-05-11 |
| WO2015153188A1 (en) | 2015-10-08 |
| TW201544174A (en) | 2015-12-01 |
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