CN203778044U - Improved air grille design for oxidation or ammonia oxidation reactor - Google Patents
Improved air grille design for oxidation or ammonia oxidation reactor Download PDFInfo
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- CN203778044U CN203778044U CN201420150507.0U CN201420150507U CN203778044U CN 203778044 U CN203778044 U CN 203778044U CN 201420150507 U CN201420150507 U CN 201420150507U CN 203778044 U CN203778044 U CN 203778044U
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- continuous metal
- metal sheet
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- air grid
- air
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 35
- 230000003647 oxidation Effects 0.000 title claims abstract description 33
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 33
- 238000013461 design Methods 0.000 title description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 87
- 239000002184 metal Substances 0.000 claims abstract description 87
- 239000003054 catalyst Substances 0.000 claims abstract description 39
- 238000003825 pressing Methods 0.000 claims description 12
- 238000012797 qualification Methods 0.000 claims 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 11
- 238000002156 mixing Methods 0.000 abstract description 5
- 239000000376 reactant Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 3
- 238000007600 charging Methods 0.000 description 23
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 14
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 239000012530 fluid Substances 0.000 description 7
- 239000004215 Carbon black (E152) Substances 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 6
- 150000002430 hydrocarbons Chemical class 0.000 description 6
- 238000005243 fluidization Methods 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 239000011733 molybdenum Substances 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 206010024769 Local reaction Diseases 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 150000002751 molybdenum Chemical class 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 230000001314 paroxysmal effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model discloses an improved air grille system for an oxidation or ammonia oxidation reactor. The improved air grille system comprises a continuous metal plate and a support system, wherein the upper surface, the lower surface and the periphery extending between the upper surface and the lower surface are limited by the continuous metal plate; a series of air holes are also limited by the continuous metal plate for guiding process air towards the upper part of the continuous metal plate from the lower part of the continuous metal plate; the support system is used for supporting the weight of the continuous metal plate and any oxidation or ammonia oxidation catalyst arranged on the continuous metal plate; insufficient reactant mixing or local reactor overheat spot in a commercial acrylonitrile reactor can be significantly relieved when the distance between a distributor system 16 and the air grille 14 is controlled at 6-24 inches (15-61cm), preferably 8-12 inches (20-30.5cm). In addition, the problems of movement of the air grille contacting or departing from a support element and mechanical failure of the air grille can be completely removed basically by virtue of an improved system with a support beam in the internal part for attaching the air grille to the wall of the reactor.
Description
Background technology
In the business of acrylonitrile is manufactured, 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 that is 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 for carrying out the typical ammonia oxidation reactor of 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, so that bed 24 fluidisations of the ammoxidation catalyst of inside reactor propylene and ammonia occur therein to the catalytic ammoxidation of acrylonitrile.
The product gas being produced by reaction exports 26 by reactor effluent and leaves reactor 10.Before doing like this, product gas is through cyclone 20, and cyclone 20 is removed any ammoxidation catalyst that these gases can be carried secretly, to turn back to catalyst bed 24 by dipleg (diplegs) 25.Ammoxidation is height heat release, therefore with cooling coil 18, takes away excessive heat, thereby reaction temperature is remained on to proper level.
Propylene and ammonia can form explosive mixture with oxygen.Yet under normal running temperature, the ammoniation catalyst in reactor 10 inside by fluidisation carrys out prevent exploding, this catalyst is preferential catalytic ammoxidation reaction before blast can occur.Correspondingly, reactor 10 is designed and is operable to that to make the unique place that allows in the normal operation period plant air to contact propylene and ammonia be in the fluid bed of ammoxidation catalyst 24, and therefore only at the temperature height of catalyst when being enough to catalytic ammoxidation reaction.
For this reason, the traditional approach that propylene and ammonia are fed to reactor 10 is used such as at U.S. 5,256, the feed distributor system 16 shown in 810, and the disclosure of this patent is incorporated herein by reference.As shown in Fig. 1 of ' 810 patents and Fig. 2 (this two width figure is renumberd Fig. 2 and the Fig. 3 for the literature), feed distributor 16 is taked the form of a series of supply pipes 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 nozzles 34 are limited in collector 30 and arm 32, and the mixture of propylene and ammonia was filled with by feed nozzle 34 in normal reaction device operating period.The number of arm 32 and feed nozzle 34 and spacing make to be roughly positioned with equably every square metre of approximately 10 to 30 feed nozzles altogether across the whole cross-sectional area of reactor 10.
Conventionally, each feed nozzle 34 is fed guard shield 36 and surrounds, and charging guard shield 36 is taked the form of the short portion section of pipeline, and the internal diameter of this pipeline is the several times of nozzle 34 diameters.The speed that charging guard shield 36 makes to pass the gas of nozzle 34 can significantly slow down leaving before entering catalyst bed 24, and this has prevented the disintegration (disintegration) of original generable catalyst.
Plant air is entering catalyst bed 24 (Fig. 1) through after air grid 14 conventionally, and air grid 14 is positioned at feed distributor 16 belows.As the well-known, air grid 14 is taked the form of continuous metal sheet conventionally, and it is limited to a series of airports or nozzle wherein.The diameter of air nozzle, through the mass flow of the plant air of air grid 14 and through the mass flow of propylene/ammonia mixture of feed distributor 16 through selecting, make ammoxidation catalyst in catalyst bed 24 in the normal operation period by the complete fluidisation of these gases.
Airport 76 (in Fig. 5) is typically provided with its oneself protective atmosphere guard shield (not shown), and this guard shield is usually located at air grid 14 belows.In addition, in many cases, air nozzle in feed nozzle 34 and air grid 14 is with one-one relationship setting, and wherein, each charging guard shield 36 is directly aimed at its corresponding air nozzle to promote to pass the mixing fast and fully of gas of these two kinds of different spray nozzles.With regard to the application's object, such air nozzle is called as uncovered.Referring to U.S. 4,801,731.In other cases, air nozzle can have the lid being arranged on directly over it, with preferentially along grizzly level (in directed or even mode) rather than face charging guard shield air distribution vertically.These lids can be the little metal caps that is welded on such air nozzle top.The design that lid is attached to the shank of grid may be selected to optimum level distribution of gas pattern.These lids above airport also can be designed to prevent that the catalyst (i) in anti-fluidized state from falling by airport and/or (ii) being deposited in and covering this (for example,, by having domatic or being made by angle bar) with it.
Although propylene/ammonia feed system of this general type is respond well, can there is some shortcoming in it.For example, the propylene/ammonia incoming mixture that passes feed distributor 16 may be inadequate with the mixing of air that passes air grid 14.This can reduce reactor performance, causes reactant to the less-than-ideal conversion of product.
In addition the form that the molybdenum dirt (molybdenum scale) being produced by ammoxidation catalyst, can cause this molybdenum dirt of a rickle to add that the catalyst of carrying secretly of additional quantity is piled with little catalyst accumulates on the upper surface of air grid 14.These heap effects are similar to wherein ammoxidation reaction and continue miniature static or " fixing " catalyst bed occurring.Because the heat transmission of fixing catalyst bed inside is far weaker than in fluid bed, so these catalyst heaps produce local hot spot, the temperature of this heat spot is high enough to damage near the catalyst of any fluidisation just arriving.For example, such temperature is high enough to the surface that calcining arrives near any fluidized catalyst, and this then reduces surface area and therefore reduces catalyst activity.And, owing to forming each catalyst granules of fluid catalyst beds, freely cycle 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 acrylonitrile reactor operates under the relative stationary temperature 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, such as for example 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 than.This circulation between low temperature and high temperature can apply sizable stress on the structural elements that forms reactor, especially at them, is connected to place each other, because the intrinsic expansion of these structural elements and systole response occur in variations in temperature.Along with passage of time, these stress can cause mechanical failure, especially in the joint being formed by welding.
For example, it is shown in Figure 4 that air grid 14 is attached to the normal mode of wall 12 of reactor 10.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 smooth metallic plate 40 substantially therein with a series of holes.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 the edge of facing of its lower end 50 and air grid plate 40 copline and be welded to this edge by weld seam 52 substantially.
In the large commercial acrylonitrile reactor of 31 feet of diameters (~ 9.4 meters), for example, air grid plate 40 can flatly expand and shrink nearly inch (1.27cm) in response to the variations in temperature experiencing 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 being associated with above-mentioned conventional design relates to air grid deflection.Because air grid 16 when reactor 10 is shut down must support the whole weight of the catalyst charge of reactor 10 inside, therefore need to be from supported underneath air grid plate 40 to adapt to this weight.Conventionally, this realizes by means of the I-beam system of shelving air grid plate 40 above.In some reactor designs, air grid plate 40 is only shelved on these I-beams.Regrettably, in these designs, air grid plate 40 has in the normal operation period the trend of vibration, and this is not only the power due to the air by this air grid plate that moves up, 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 these designs, the power of the air moving 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, in the time of in the 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 find, the problems referred to above of air grid vibration and air grid mechanical failure can by means of the wall for air grid being attached to reactor with and the improved system of the brace summer of inside come substantially fully to eliminate.
Therefore, the disclosure provides a kind of improved feed system for the commercialization oxidation such as acrylonitrile reactor or ammonia oxidation reactor according to a feature, it comprises: feed distributor, and it is for being supplied to the mixture of undersaturated and/or saturated C3 to C4 hydrocarbon and ammonia the inside of reactor; and air grid system, it is for supplying air to the inside of reactor, feed distributor comprises the pipeline that main header tube and fluid are attached to main header tube and separate from main header tube, main header tube and a pipeline all limit prone feed nozzle, feed distributor system also comprises the charging guard shield being 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 and will pass C3 to the C4 hydrocarbon of its corresponding feed nozzle and the inside that the downward guiding of ammonia enters reactor, air grid system comprises the continuous metal sheet of the below that is arranged in feed distributor system, continuous metal sheet is limited to a series of airports wherein for plant air is directed to the top of continuous metal sheet from the below of continuous metal sheet towards sparger system, wherein in the distance between the upper surface of continuous metal sheet and the far-end of charging guard shield, be selected as between approximately 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 that comprises propane, propylene, butane, butylene and their mixture.
On the other hand, provide a kind of oxidation or method of ammonia oxidation reactor feed of being used to, it comprises mixture saturated and/or undersaturated C3 to C4 hydrocarbon and ammonia is supplied to the inside of reactor by feed distributor.Feed distributor comprises the pipeline that main header tube and fluid are attached to main header tube and separate 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 being associated with corresponding feed nozzle, each charging guard shield comprises near-end, this near-end be connected to corresponding pipeline or header tube and be arranged to by pass saturated and/or undersaturated C3 to the C4 hydrocarbon of its corresponding feed nozzle and ammonia downwards guiding enter the inside of acrylonitrile reactor.The method also comprises passes through air grid system supply to the inside of reactor by air.Air grid system comprises the continuous metal sheet of the below that is arranged in feed distributor system, and continuous metal sheet is limited to a series of airports wherein for plant air is directed to the top of continuous metal sheet from the below of continuous metal sheet towards sparger system.On the one hand, in the distance between the upper surface of continuous metal sheet and the far-end of charging guard shield, be between approximately 6 to approximately 24 inches (approximately 15 to about 61cm).
In addition, the disclosure provides a kind of improved air grid system of using for the commercialization oxidation such as acrylonitrile reactor or ammonia oxidation reactor according to another feature, this improved air grid system comprises: continuous metal sheet, the periphery that it limits upper surface, lower surface and extends between upper surface and lower surface, this continuous metal sheet also limits a series of airports for plant air is led towards the distributor feed system that is positioned at continuous metal sheet top from continuous metal sheet below, and support system, it is for supporting continuous metal sheet and can being shelved on any oxidation on continuous metal sheet or the weight of ammoxidation catalyst, wherein support system comprises a series of brace summers and is attached to regularly a series of support member pressing elements (hold-downs) of the downside of continuous metal sheet, each brace summer has the upper support surface of the downside of joint continuity metallic plate, each support member pressing element is arranged to be bonded on as follows the matching surface that is limited to its upper surface below in corresponding brace summer, make support member pressing element prevent that continuous metal sheet is lifted away from into serial brace summer.
On the other hand, provide a kind of for reducing the method for movement of the air grid system of commercial oxidation or ammonia oxidation reactor.The air grid system that provides is provided the method, and this air grid system comprises: continuous metal sheet, the periphery that it limits upper surface, lower surface and extends between upper surface and lower surface.This continuous metal sheet is also defined for and plant air is directed to a series of airports of the top of continuous metal sheet from the below of continuous metal sheet; And support system, it is for supporting continuous metal sheet and can being shelved on any oxidation on continuous metal sheet or the weight of ammoxidation catalyst.On the one hand, support system comprise the downside all with joint continuity metallic plate upper support surface one-tenth series brace summer and be attached to regularly continuous metal sheet downside become serial support member pressing element.Each support member pressing element is arranged to be bonded on as follows the matching surface that is limited to its upper surface below in corresponding brace summer, makes support member pressing element prevent that continuous metal sheet is lifted away from into serial brace summer.
In addition, the disclosure provides a kind of improved air grid system of using for the commercialization oxidation such as acrylonitrile reactor or ammonia oxidation reactor according to another feature, this improved air grid system comprises: continuous metal sheet, the periphery that it limits upper surface, lower surface and extends between upper surface and lower surface, this continuous metal sheet also limits a series of airports for plant air is led towards the distributor feed system that is positioned at continuous metal sheet top from the below of continuous metal sheet, and coupling assembling, it is for being attached to the periphery of continuous metal sheet the sidewall of oxidation or ammonia oxidation reactor, wherein coupling assembling comprises the dividing plate of flex plate and cooperation, flex plate and dividing plate comprise the endless metal sheet material that limits top and bottom separately, flex plate and dividing plate are all arranged to and the sidewall of oxidation or ammonia oxidation reactor consistent (congruent) substantially, its median septum is attached to the sidewall of oxidation or ammonia oxidation reactor, wherein the bottom of flex plate is attached to the periphery of continuous metal sheet, and wherein flex plate is attached to dividing plate so that flex plate is limited to the mode of the bottom of extending the below, bottom of dividing plate, so that the deviation in the diameter of the continuous metal sheet causing because of the variations in temperature of inside reactor can be by adapting to the bottom deflection of flex plate.
On the other hand, provide that a kind of the method comprises provides continuous metal sheet for adapting to the method in the deflection of air grid system, 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 airports for plant air is directed to the top of continuous metal sheet from the below of continuous metal sheet, and for the periphery of continuous metal sheet being attached to the coupling assembling of the sidewall of reactor.Coupling assembling comprises the dividing plate of flex plate and cooperation, and flex plate and dividing plate comprise the endless metal sheet material that limits top and bottom separately.Flex plate is all arranged to substantially consistent with the sidewall of reactor with dividing plate, its median septum is attached to the sidewall of reactor, wherein the bottom of flex plate is attached to the periphery of continuous metal sheet, and wherein flex plate is attached to dividing plate so that flex plate is limited to the mode of the bottom of extending the bottom below of dividing plate, so that the deviation on the diameter of the continuous metal sheet causing because of the variations in temperature of acrylonitrile inside can be by adapting to the bottom deflection of flex plate.
Accompanying drawing explanation
Fig. 1 is schematic diagram, and it shows the reactor portion section for the preparation of the conventional ammonia oxidation reactor of acrylonitrile;
Fig. 2 is plane, and it shows the downside of conventional sparger system of the ammonia oxidation reactor of Fig. 1;
Fig. 3 is the cutaway view along the line 3-3 intercepting of Fig. 2, and Fig. 3 shows the feed nozzle and the charging guard shield being associated of the conventional sparger system of Fig. 2;
Fig. 4 illustrates the usual manner that the air grid of acrylonitrile reactor is attached to the wall of reactor;
Fig. 5 is the partial sectional view of acrylonitrile reactor, it shows First Characteristic of the present disclosure, wherein by suitably distance that air grid and feed distributor are spaced apart from each other, improve the performance of conventional acrylonitrile reactor, and reduced the mechanical failure to some parts of acrylonitrile reactor;
Fig. 6 illustrates Second Characteristic of the present disclosure, wherein provides for supporting the novel support system of the air grid of acrylonitrile reactor; And
Fig. 7 illustrates the 3rd feature of the present disclosure, wherein provides for the air grid of acrylonitrile reactor 14 being fixed to unique coupling assembling of the sidewall of reactor.
The specific embodiment
Fig. 5 shows the First Characteristic 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).Particularly, as shown in the figure, feed distributor 16 comprises a plurality of charging guard shields 60, each charging guard shield be limited to the collector 30 of sparger system or the corresponding feed nozzle in arm 32 and be associated.Each charging guard shield limit be connected to its corresponding collector 30 or arm 32 near-end 62 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, a series of airports 76 that continuous metal sheet 70 is arranged in feed distributor 16 belows and limits upper surface 72, lower surface 74 and extend between upper surface 72 and lower surface 74, for upwards leading the plant air that enters ammonia oxidation reactor from continuous metal sheet below towards feed distributor 16.
According to this feature of the present invention, it is that 6 to 24 inches (~ 15 to ~ 61cm) are located that the far-end 64 of charging guard shield 60 is arranged to distance at the upper surface 72 from continuous metal sheet 70.Preferably, to be arranged to the distance at the upper surface 72 from continuous metal sheet 70 be that 8 to 12 inches (~ 20 to ~ 30.5cm) are located to the far-end 64 of charging guard shield 60.According to this feature of the present disclosure, what found is, not only by inadequate reactant, mixing the poor reactor performance causing can eliminate greatly by following the method, and also can be by following that the method is eliminated or at least roughly reducing to the damage of ammoxidation catalyst and the other problem that caused by local reaction device heat spot.
From theory/concept angle, seeming useful is the distance being minimized between air grid 14 and feed distributor 16, because this seems to contribute in the mixing that passes the feeding gas of distributor 16 and pass the maximum possible degree between the plant air of air grid 16.Yet, find in practice, air grid 14 is arranged to such an extent that too close feed distributor 16 contributes to form reactor heat spot, as mentioned above.When the distance between air grid 14 and feed distributor 16 too hour, some airports 76 in continuous metal sheet 70 or the far-end 64 of charging guard shield 60 or both become and are positioned at the catalyst/molybdenum dirt heap on the upper surface 72 that is deposited in inherently 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 wherein heat and transmits fixing catalyst bed poor and that therefore temperature raises rapidly.Correspondingly, the distance between air grid 14 and feed distributor 16 of measuring between the far-end 64 of charging guard shield 60 and the upper surface 72 of continuous metal sheet 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, in the distance that is greater than approximately 24 inches (~ 61cm), a part for catalyst in reactor, particularly the part between air grid 14 and feed distributor 16, not can be effectively used in reaction.This has reduced propylene and ammonia react thing to the conversion of product acrylonitrile, and this is obviously disadvantageous.Correspondingly, the ultimate range between air grid 14 and feed distributor 16 of measuring between the far-end 64 of charging guard shield 60 and the upper surface 72 of continuous metal sheet 70 remains on and is no more than approximately 24 inches (~ 61cm), is preferably no more than 18 inches (~ 45.7cm), is no more than 14 inches (~ 35.5cm) and is no more than on the other hand 12 inches (~ 30.5cm) on the other hand, to prevent that this thing happens.
Fig. 6 shows the Second Characteristic of technology of the present disclosure, the weight for the continuous metal sheet 70 of support air grid 14 with 80 novel support systems that represent substantially is wherein provided, has comprised the weight that can be shelved on any ammoxidation catalyst on this continuous metal sheet.As is shown in this figure, support system 80 adopts the form of a series of brace summers 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 of shelving continuous metal sheet 70 thereon.In addition, the downside of each top transverse part section 84 limits matching surface 88, and the support member pressing element carrying for the continuous metal sheet 70 with by air grid 14 engages, as discussed further below.
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 shown in this figure further, each protuberance 92 extends at the downside of the top transverse part section 84 of corresponding I-beam 82, there, and protuberance 92 engaged fit surfaces 88.Utilize this structure, each support bar 90 plays the effect of pressing element, for continuous metal sheet 70 and the upper surface 86 of I-beam 82 are kept in touch, thereby prevent that this continuous metal sheet is 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; end and facing between part of I-beam 82 at each support bar 90 are furnished with suitable space 94 and 96, the variation in the length of these support bars that occur inherently due to the variations in temperature of inside reactor experience between startup and down period for adaptation.
Utilize this structure, the protuberance 92 by support bar 90 engages the corresponding matching surface 88 of I-beams 82 and continuous metal sheet 70 is pressed on securely on the upper surface 86 of I-beam.Be appreciated that and provide other structure of similar attachment means can replace support bar 90 and its protuberance being associated 92 to use.Under any circumstance; due to be arranged in the end of each support bar 90 and I-beam 82 in the face of the space 94 and 96 between part, as start and down period between variation in the length of the result of the reactor 10 inner remarkable variations in temperature that occur and the support bar 90 that occurs by these spaces, easily adapt to.Therefore, the mechanical failure of support system 80 is eliminated greatly.
Fig. 7 shows the 3rd feature of technology of the present disclosure, wherein provides unique coupling assembling for the periphery of the continuous metal sheet of air grid 14 70 being fixed to the sidewall 12 of reactor 10.As is shown in this figure, substantially with 100 these coupling assemblings that represent, comprise flex plate 102 and the dividing plate 104 coordinating.Flex plate 102 comprises elongated metal sheet, and its two ends weld together, so that flex plate 102 presents annular shape, and the right part section shape of cylindricality particularly.Utilize this shape, flex plate 102 is substantially consistent with the sidewall 12 of the appended reactor of linking 10 of 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, so that dividing plate 104 also presents annular shape.
As shown in Fig. 7 further, dividing plate 104 is arranged between flex plate 102 and the sidewall 12 of reactor 10, the bottom 114 that extend 112 belows, bottom that make flex plate 102 be limited to dividing plate 104.Preferably, approximately 6 to approximately 10 inches (approximately 15 to about 25cm), the distance of approximately 7 to approximately 9 inches (approximately 18 to about 23cm) are more desirably extended in the bottom 110 of flex plate 102 below the bottom 112 of dividing plate 104.
As further shown in Figure 7, the periphery of the continuous metal sheet 70 of air grid 14 is preferably arrived in the bottom 110 of flex plate 102 by weld attachment.Utilize this structure; due to start and down period between the variation that occurs in the diameter of continuous metal sheet 70 of air grid 14 of marked change in the inner temperature occurring of reactor 10 by the deflection of the bottom 114 (that is the part of the flex plate 102, extending below the bottom 112 at dividing plate 104) of flex plate 102, easily adapt to.Therefore the mechanical failure of joint that, the periphery of the continuous metal sheet of air grid 14 70 is connected to the sidewall 12 of reactor 10 is eliminated greatly.
Described various aspects herein, the aspect shown in Fig. 4-7 more specifically, can be used for having the reactor of various sizes diameter.Aspect preferred, reactor can have from approximately 5 to approximately 12 meters, approximately 8 to approximately 12 meters and the external diameter of approximately 9 to approximately 11 meters on the other hand on the other hand.In a further advantageous embodiment, when use between approximately 8 to approximately 12 meters or approximately 9 to approximately 11 meters reactor external diameter time, air nozzle is uncovered, air is introduced in reactor vertically, most preferably towards charging guard shield, leads vertically.In an alternative, when use between approximately 8 to approximately 12 meters or approximately 9 to approximately 11 meters reactor external diameter time, the air nozzle in air grid is with cover, air preferentially tegmentum is flatly distributed in reactor.
Although only described some embodiment of technology of the present disclosure herein, should be appreciated that in the situation that do not depart from the spirit and scope of this technology, can carry out many modifications.All such modifications are intended to be included in the scope of this technology being only limited by the appended claims.
Claims (2)
1. the improved air grid system for using at commercialization oxidation or ammonia oxidation reactor, described improved air grid system comprises:
Continuous metal sheet, the periphery that it limits upper surface, lower surface and extends between described upper surface and described lower surface, described continuous metal sheet also limit a series of airports for by plant air from described continuous metal sheet described in direction the top of continuous metal sheet lead; And support system, it is for supporting described continuous metal sheet and can being shelved on any oxidation on described continuous metal sheet or the weight of ammoxidation catalyst,
Wherein, described support system comprises a series of brace summers and is attached to regularly a series of support member pressing elements of the downside of described continuous metal sheet, each brace summer has the upper support surface of the downside that engages described continuous metal sheet, each support member pressing element is arranged to be bonded on as follows the matching surface that is limited to its upper surface below in respective support beam, makes described support member pressing element prevent that described continuous metal sheet is lifted away from described a series of brace summer.
2. improved air grid system according to claim 1, it is characterized in that, described brace summer is the I-beam with corresponding top transverse part section, the downside of each top transverse part section limits matching surface, wherein, the continuous metal sheet of described air grid system limits lower surface, and further, wherein, described support member pressing element comprises the support bar of the lower surface that is attached to described continuous metal sheet, described support bar has the end that limits protuberance, and described protuberance is arranged to engage the matching surface by the top transverse part paragraph qualification of described I-beam.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420150507.0U CN203778044U (en) | 2014-03-31 | 2014-03-31 | Improved air grille design for oxidation or ammonia oxidation reactor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420150507.0U CN203778044U (en) | 2014-03-31 | 2014-03-31 | Improved air grille design for oxidation or ammonia oxidation reactor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190331A (en) * | 2014-09-02 | 2014-12-10 | 英尼奥斯欧洲股份公司 | Temperature control for ammoxidation reactor |
| CN104941534B (en) * | 2014-03-31 | 2018-03-20 | 英尼奥斯欧洲股份公司 | For the design of the improved air grid of oxidation or ammonia oxidation reactor |
| 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 |
| CN112439367A (en) * | 2019-09-05 | 2021-03-05 | 中石油吉林化工工程有限公司 | Air distribution plate |
-
2014
- 2014-03-31 CN CN201420150507.0U patent/CN203778044U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104941534B (en) * | 2014-03-31 | 2018-03-20 | 英尼奥斯欧洲股份公司 | For the design of the improved air grid of oxidation or ammonia oxidation reactor |
| CN104190331A (en) * | 2014-09-02 | 2014-12-10 | 英尼奥斯欧洲股份公司 | Temperature control for ammoxidation reactor |
| 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 |
| CN112439367A (en) * | 2019-09-05 | 2021-03-05 | 中石油吉林化工工程有限公司 | Air distribution plate |
| 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 |
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