CN104941531B - It is designed for the cooling coil of oxidation reactor or ammonia oxidation reactor - Google Patents
It is designed for the cooling coil of oxidation reactor or ammonia oxidation reactor Download PDFInfo
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- CN104941531B CN104941531B CN201410125032.4A CN201410125032A CN104941531B CN 104941531 B CN104941531 B CN 104941531B CN 201410125032 A CN201410125032 A CN 201410125032A CN 104941531 B CN104941531 B CN 104941531B
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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
- C07C253/26—Preparation of carboxylic acid nitriles by ammoxidation of hydrocarbons or substituted hydrocarbons containing carbon-to-carbon multiple bonds, e.g. unsaturated aldehydes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D13/00—Heat-exchange apparatus using a fluidised bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
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- General Engineering & Computer Science (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
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Abstract
The present invention relates to the cooling coil designs for oxidation reactor or ammonia oxidation reactor.It can more closely be encapsulated with lateral arrangement rather than linear array to limit the separate lines of cooling coil by providing for the cooling coil in commercial oxidation reactor or ammonia oxidation reactor.
Description
Background technology
Various techniques and system for manufacturing acrylonitrile and methacrylonitrile are known.Common process is usually directed to logical
It crosses straight in the presence of a catalyst selected from the hydrocarbon of set being made of propane, propylene or isobutene, ammonia and oxygen
The recycling and purification of the reversed acrylonitrile/methacrylonitrile that should be generated.For example, acrylonitrile business manufacture in, propylene, ammonia and
Oxygen reacts according to following reaction scheme one：
CH2=CH-CH3 + NH3 + 3/2 O2 → CH2=CH-CN + 3 H2O
Raised in the case of the fluid bed ammoxidation catalyst that commonly referred to as process of ammoxidation is suitble in presence
It is performed at temperature (for example, 350 DEG C to 480 DEG C) with gas phase.
Fig. 1 shows the typical acrylonitrile reactor for performing the process.As shown here, reactor 10 includes anti-
Answer device shell 12, air grid 14, supply sprinkler 16, cooling coil 18 and cyclone separator 20.During normal operation, mistake
Journey air is filled with by air intake 22 in reactor 10, while the mixture of propylene and ammonia is filled with instead by supply sprinkler 16
It answers in device 10.The flow velocity of the two occurs third high enough to fluidize the ammoxidation catalyst bed 24 in inside reactor at this
Alkene and ammonia are to the catalytic ammoxidation of acrylonitrile.
By the product gas that reaction generates reactor 10 is left by reactor effluent outlet 26.Before doing so,
They pass through cyclone separator 20, and what these gases of the removal of cyclone separator 20 may carry is used to return to by dipping tube 25
Any ammoxidation catalyst of catalyst bed 24.Ammoxidation is typically height fever, and therefore cooling coil component 18 is used for
Excessive heat is extracted, and reaction temperature is therefore maintained at appropriate level.
In this regard, Fig. 2 schematically shows the designs of conventional chilling coil pack 18 for this purpose.Fig. 2 is
The axial cross-sectional view in part of reactor 10, it illustrates one group of cooling coils in the cooling coil component of reactor 10, should
Group cooling coil is made of three individual cooling coils (cooling coil 42, cooling coil 44 and cooling coil 46).Cooler pan
Pipe 42 is cold including the entrance 48 for receiving cooling water and for discharging this after being heated and being partly transformed into steam
But the outlet 50 of water.Equally, cooling coil 44 includes entrance 52 and outlet 54, and cooling coil 46 includes entrance 56 and outlet
58.As shown in Figure 2, it is each by a series of vertically oriented cooling coil circuits 57 in cooling coil 42,44 and 46
It limits, each circuit is made of a pair of elongated interconnection cooling duct 60, and the cooling duct 60 is at its bottom by lower U-bend
Folding accessory 62 is connected on each other.Continuous cooling coil circuit 57 place also at the top of it is connected to by upper U-bend folding accessory 63
On each other, to be formed from the entrance of each corresponding cooling coil to the continuous flow path of outlet.
Fig. 3 is the top view of cooling coil component 18 shown in Fig. 2.As will be recognized from Fig. 2 and Fig. 3,
Cooling coil 42,44 and 46 forms one group of cooling coil, is coplanar, that is, each to be located in common vertical plane.Such as Fig. 3
In be further illustrated, cooling coil component 18 is made of these multigroup cooling coils, and each group of wherein these cooling coils is evenly distributed with
Be set to be substantially parallel to each other and (optionally) with it is equally spaced apart from one another.In addition, such as can in figure 3 it is further seen that
Sample, although many cooling coil groups in the cooling coil component include three different cooling coils, other cooling coils
Group includes two or four cooling coil, and two cooling coil groups include only one cooling coil.
Fig. 4 is the amplification top view intercepted on the line 4-4 of Fig. 2, shows the cooling coil component 18 of Fig. 2 and Fig. 3
Specific structure more details.Specifically, Fig. 4 is the schematic diagram for the upper U-bend folding accessory 63 for only showing cooling coil.
As shown in Figure 4, cooling coil 61 includes entrance 35, entrance 35 is connected to the first cooler pan of cooling coil 61
Supply line 64 on the top of route of pipe line (not shown) and for by the continuous coil pipe connection of cooling coil to each other
On a series of upper U-bend folding accessory 63.Also as shown in the drawing, all these elements are (that is, all upper U-bend folding accessories 63
And supply line 64) all coplanar, that is, all of which is all located on identical common vertical plane D.In addition, from Fig. 2 and Fig. 3
In it will be further appreciated that, remaining element in the cooling coil is (that is, form each cooling coil circuit 57 vertically
The cooling duct 60 of orientation and associated lower U-bend folding accessory 62) it also is located in the common vertical plane.Shown specific
In embodiment, each upper U-bend folding accessory 63 is supported from below by backbar 70, and backbar 70 is received in is matched by each U-shaped
In the inner curve that part limits.Therefore, including its all component part (that is, upper U-bend folding accessory 63, vertically oriented
Conduit 60 and lower U-shaped bending part 62) and cooling coil the entire contents cooling water of cycle (that is) each cooler pan
The total weight of pipe is supported by its corresponding backbar 70.
As further shown in Figure 4, suitable aisle or channel 74 be arranged at certain altitude every a cooler pan
Between pipe, this is readily close to provide highly at upper U-bend folding accessory 63 or near it, and supports determining for cooling coil
Phase checks and/or repairs required any maintenance personnel.
Fig. 5 is another schematic diagram, shows how the different cooling coils in control cooling coil component 18.Herein
Aspect, the convention during the operation of conventional propylene nitrile reactor 10 are to make cooling coil " in turn ", that is, independently and continuously
It periodically closes and then restarts each cooling coil.Most of business ammoxidation catalysts refine molybdenum, and molybdenum is generally in a timing
Interior be deposited on the outer surface of cooling coil is used as incrustation.Since the molybdenum incrustation negatively affects the performance of cooling coil, therefore
It is desirable for often removing the molybdenum incrustation cooling coil to be kept suitably to act on.In general, this is by periodically closing and so
After restart each cooling coil to complete, this is because the closing/reset routine is due to closing and and then restarting and cause cooler pan
The wide temperature of pipe experience fluctuates and causes the not inapparent mechanical shock to cooling coil.The mechanical shock is most of
In the case of be enough to remove at least some molybdenum incrustation that may be had been deposited on cooling coil surface, and restore in the case
At least some thermal heat transfer capabilities of the coil pipe.Which results in the stable operations in the extended period.
In order to by chilled(cooling) water supply (CWS) to independent cooling coil, generally using the structure shown in Fig. 5.As shown there,
The entrance 35 of cooling coil 61 is in fluid communication with process water inlet header 80, and the height of process water inlet header 80 is usually located to
Accessory 63 is rolled over less than upper U-bend.Equally, the outlet 65 of cooling coil 61 is in fluid communication with process water outlet header 62, process water
The height of outlet header 62 is usually located to roll over accessory 63 higher than upper U-bend.In general, process water inlet header 80 and outlet
The conduit forms that collector 82 is oriented using the larger continuous horizontal entirely around reactor 10.Independently periodically close and again
Each cooling coil is opened generally by being completed with the associated corresponding cut-off valve 84 of the entrance 35 of the cooling coil, most
In number design, which is simple switch valve, opposite with the control valve for being capable of accurate control fluid flow rate.
It is furthermore noted that cooling coil 61 of the cut-off valve 84 between process water inlet header 80 and process water outlet header 82
At least one of valve.I other words cooling coil 61 is configured without any additional valve or other flow control apparatus, especially
It is not export 65 associated flow control valves with cooling coil.This is because such additional valve need not be described herein above
Mode realizes the desired operation and control of cooling coil.It is also eliminated in addition, eliminating output flow control valve to safety relief
The needs of valve else if using this output flow control valve, will just need safety relief valve (i.e., it would be desirable to each independent disk
PSV on pipe).
An area on entire reactor as a whole and out of reactor is to another area by acrylonitrile reactor
Device holding is important good reactor performance at or approximately at its optimal reaction temperature.Further, since heat can be from anti-
The rate that device extracts is answered usually to be to determine the rate-limiting step for the maximum capacity that acrylonitrile reactor can be run, thus it is good cold
But coil design is also important.In addition, poor cooling coil design and/or operation can cause excessive cooling coil rotten
Erosion, this can need costly premature repairs.
Therefore, the improvement of design and the operation of the cooling coil of commercial propylene nitrile reactor is constantly needed to, is not only improved anti-
Device performance is answered, and reduces the erosion of conduit, so as to reduce downtime and repair cost.
Invention content
According to the present invention, to being used for the cold of typical oxidation reactor or ammonia oxidation reactor such as commercial propylene nitrile reactor
But coil pack design and operation carried out a series of improvement.As a result, not only improving reactor performance, but also extend
The service life of cooling coil component.
Therefore, in one embodiment, the present invention provides one kind for removing by oxidation reactor or ammoxidation reaction
The cooling coil component of the excessive heat of device generation, the cooling coil component include multiple cooling coils, and each cooling coil wraps
Multiple cooling coil circuits are included, is fluidly connected in series on each other, goes out to limit with cooling water inlet and cooling water
The cooling water path of mouth, each cooling coil circuit limits vertically oriented cooling coil track plan, wherein each cooling
Coil pipe extends out of reactor towards the periphery of reactor along corresponding vertically oriented main cooling coil plane, and further its
In, at least some of at least one cooling coil cooling coil circuit is arranged such that its cooling coil track plan with being somebody's turn to do
The main cooling coil plane of cooling coil is lateral.
In addition, in a second embodiment, the present invention provides one kind for removing by oxidation reactor or ammoxidation reaction
The cooling coil component of the excessive heat of device generation, cooling coil component include single or multiple cooling coils, each cooling coil
Limit flow of cooling water access, cooling water inlet and the cooling water outlet for being carried through the cooling water at this, Ge Geleng
But coil pipe further includes condensate water cutoff valve associated with its cooling water inlet, each cooling coil also without for control across
The valve of the cooling flow of its cooling water outlet, the length of wherein at least some flow of cooling water accesses are different from each other.In this regard,
The cooling coil of certain amount is selected to provide the average percent of about 15% or less the cooling water for being transformed into steam.
In addition, in the third embodiment, the present invention provides a kind of for removing by oxidation reactor or ammonia with wall
The cooling coil component of the excessive heat of oxidation reactor generation, the cooling coil component include single or multiple cooling coils, respectively
A cooling coil includes multiple cooling coil circuits, is fluidly connected in series on each other, to limit cooling water path,
The cooling water path has across the cooling water inlet of the wall of reactor and cooling water outlet, and wherein cooling water inlet includes rigidity
Ground is attached to the cooling coil inlet fitting on the wall of reactor and the thermal sleeve in the accessory of cooling water inlet, wherein hot jacket
The outer diameter of pipe is less than the internal diameter of cooling coil inlet fitting, to limit heat space therebetween.
In another embodiment, it is given birth to the present invention provides one kind for removing by oxidation reactor or ammonia oxidation reactor
Into excessive heat cooling coil component, the cooling coil component include multiple cooling coils, each cooling coil include one
Serial cooling coil circuit, the first line and the last circuit at serial end which includes serial beginning are multiple
Cooling coil circuit is fluidly connected on each other, is led to limit the cooling water with cooling water inlet and cooling water outlet
Road, cooling coil component further include the cooling coil inlet header that is in fluid communication with the first line of each cooling coil and with it is each
The cooling water outlet collector that the last circuit of a cooling coil is in fluid communication, each cooling coil are further included the cooling coil
The cooling water outlet conduit that last circuit is connect with cooling water outlet collector, wherein the height of cooling coil outlet header is less than each
The height of the cooling coil delivery channel of a cooling coil.
Description of the drawings
The present invention can be more easily understood by referring to the following drawings, in the accompanying drawings：
Fig. 1 shows the routine business acrylonitrile reactor for performing the ammoxidation of propylene and ammonia to acrylonitrile；
Fig. 2 is the structure and fortune for showing the conventional chilling coil design for the routine business acrylonitrile reactor in Fig. 1
Capable schematic diagram；
Fig. 3 is the top view of the conventional chilling coil design of Fig. 2；
Fig. 4 is the top view in greater detail similar to Fig. 3 for the conventional chilling coil design for showing Fig. 2；
Fig. 5 is the schematic diagram similar to Fig. 2, but shows single cooling coil 61 and its operation method；
Fig. 6 and Fig. 8 is the cooling coil of the schematic diagram, wherein routine business acrylonitrile reactor of the fisrt feature of the present invention
Than more closely being encapsulated in conventional design；
Fig. 7 is the top view similar to Fig. 2 and Fig. 4, is illustrated only including U-bend folding accessory and aligned with each other these on
The upper U-bend of one cooling coil of the conventional design of these figures rolls over accessory 63, is intercepted on the line 7-7 of Fig. 7 in Figure 5；
Fig. 9 shows for the cooling coil suspender available for the cooling coil of Fig. 6 and Fig. 8 are suspended on its supporting structure
It is intended to；
Figure 10 is the schematic diagram of another feature of the invention, and wherein thermal sleeve is used to protect the entrance of cooling coil with being somebody's turn to do
Cooling coil entrance across reactor wall joint；And
Figure 11 is the schematic diagram of another feature of the present invention, wherein for receiving cooling water and steam from cooling coil
Outlet header is repositioned onto the position at the top less than these cooling coils.
Specific embodiment
In accordance with the first feature of the invention, the novel arrangement of cooling coil is employed, can be increased in reactor
The encapsulation of cooling coil.As a result, the total surface area generally provided by cooling coil component can effectively increase, this after and
The more preferable overall control that cooling coil is caused to run, and the increase of total reactor capacity is at least resulted in some cases.
This feature is shown in FIG. 6, and Fig. 6 is the schematic diagram similar to Fig. 4, wherein it illustrates each cooling coils 61
The arrangement of upper U-bend folding accessory 63 and its relative to channel 74 and the cloth of the cooling coil backbar 70 of cooling coil component
It puts.Fig. 7 is seen also, Fig. 7 schematically shows the arrangement of the coil pipe circuit in the conventional design of Fig. 2, Fig. 3, Fig. 4 and Fig. 5.By its
Compared with Fig. 8, Fig. 8 is the schematic diagram similar to Fig. 7, but shows the cooling coil circuit in the design of the present invention in Fig. 6
Arrangement.
As shown in Figure 6, cooling coil 61 upper U-bend folding accessory 63 arranged relative to each other with offset relationship rather than
With coplanar relation as shown in Figure 4.In conventional design as shown in Figure 4, cooling coil 61 is out of reactor 10 along vertical
The plane D directly oriented extends to the periphery (that is, from position R to position S) of reactor 10.For convenience's sake, it is vertically fixed
To plane D be referred to herein as the main cooling coil plane of cooling coil 61.As further shown in Figure 4, cooling coil 61
All major components (that is, all vertically oriented cooling ducts 60 and all lower U-bends folding accessories 62 and upper U-bend folding
Accessory 63) be all coplanar, that is, all of which in its center or axis be located in the plane in the sense that with it is vertically oriented
Main cooling coil plane D alignment.This further schematically shows in the figure 7, and Fig. 7 shows coolant guide pipe 60 and cold
But the lower U-bend folding accessory 62 of coil pipe circuit 57 is in its center or axis is all is all located at public vertically oriented main cooler pan
In the sense that in pipe plane D with it is aligned with each other.In addition, as further shown in Figure 4, channel 74 also be disposed on these major components it
Between and be parallel to these major components.
However, in the design of the change of this aspect of the invention, at least some cooler pans of at least one cooling coil
It is lateral that the route of pipe line 57 is arranged to the vertically oriented main cooling coil plane being generally located therein with cooling coil.It is general and
It says, all cooling coil circuits 57 of at least one cooling coil are all arranged by this method, and in some embodiments, it is most of
Or all cooling coil circuits in even all cooling coils are all arranged by this method.
The arrangement more completely shows that Fig. 8 shows the cooling water of each cooling coil circuit 57 of the design in fig. 8
Conduit 60 and lower U-shaped accessory 62 are located in the corresponding cooling coil track plan Q of its own, are arranged to relative to cooling coil
61 are generally positioned at vertically oriented main cooling coil plane D α at an acute angle therein.Sharp angle α can be any desired angle.
On the one hand, angle is between about 30 ° to about 60 °, and another aspect is between about 40 ° to about 50 °.
As further shown in Figure 6, the backbar 70 for carrying the total weight of cooling coil 61 and its content is positioned to
Accessory 63 is rolled over higher than U-bend rather than rolls over accessory less than these U-bends as in the conventional design of Fig. 2, Fig. 3, Fig. 4 and Fig. 5.
In addition, as shown in Figure 9, suitable bearing suspender is provided for each U-bend folding accessory 63 is made to be suspended on it associated
Backbar 70 on.
First advantage of the design of the change of this feature of the present invention is cooling coil circuit 57 than in conventional design
In more closely encapsulate.This causes the effective surface area of cooling coil component to increase using the design relative to conventional design
Add, this realizes the cooling capacity of bigger after and compared to conventional design and has the potentiality of bigger temperature of reactor control.
Cooling coil design as described herein provides more cooling coil circuits in every meter of reactor diameter.In this regard, this paper institutes
The coil design stated provides about 40 to about 60 cooling coil circuits and on the other hand for every meter of reactor diameter
It is effective that every meter of reactor diameter, which provides about 45 to about 55 cooling coil circuits,.
Second advantage of the design of the change is due to periodically close and restarting and gives to forming each of the design
The mechanical stress of the hardware of cooling coil is better adapted to using the design compared to conventional design.This is because this hair
Upper U-bend folding accessory 63 in bright design is suspended on by suspender on supporting arm 70, and be also arranged in and supporting arm 70
Laterally.Therefore, when the cooling coil of design of the present invention is expanded and shunk in response to temperature change, than in the case of other more
Few stress is given to these cooling coils.This is because the signal portion of the expansion and contraction is laterally sent out with these backbars
It is raw, and further because suspender is associated as occurring between absorption change in size and these cooling coils and backbar
Mobile bolster.
Therefore, because the design development, not it is likely that accommodating ancillary equipment needed for this component (and particularly increasing
The number of channel and backbar) in the case of increase the cooling capacity that is provided by cooling coil component, and it is also possible to eliminate
Or at least essence is reduced normally due to periodically closing and being given caused by restarting to the mechanical stress of cooling coil and occurred cold
But coil pipe failure and associated maintenance cost.As noted, design as described herein provides more coil pipes.More polydisc
Pipe can smaller continually recycle.
Second feature according to the present invention, flow passage in the different cooling coils of cooling coil component of the invention
Cross-sectional area is adjusted so that the cooling water inflow for being transformed into steam in each cooling coil component has about 15% or smaller
Average value, be about 10% to about 15% on the other hand.It is desirable that, based on the total of the cooling water across cooling coil
Amount, these cross-sectional areas are selected such that be transformed into the cooling of steam in all cooling coils in the cooling coil component
Water and mutual difference are not more than 5%, it may be desirable to no more than 4%, no more than 3%, no more than 2% or even no greater than 1%.
As noted, cooling coil component may include cooling coil, and at this, each cooling coil includes different numbers
Purpose cooling coil circuit.For example, cooling coil component may include cooling coil, at this, most of cooling coils have more
A cooling coil circuit (for example, 6 cooling coil circuits), and some cooling coils only have there are one cooling coil circuit.It is cold
But productivity is realized in the removal of coil pipe, and the different number of cooling coil circuit that can be removed in cooling coil cycle provides
For keeping the operational flexibility of desired productivity.
Shown in Fig. 2, the different cooling coils in typical commercial propylene nitrile reactor are generally not all
All there is equal number of cooling coil circuit 57.As a result, some in these cooling coils are with longer flow passage, and
It is other that there is shorter flow passage.This feature can lead to the non-uniform operation of cooling coil, because of longer flow passage
The residence time of interior cooling water can no doubt be more than the residence time of the cooling water in shorter flow passage.It is as a result, longer
Than thering are more cooling waters to be transformed into steam in shorter access in flow passage.This can no doubt cause in longer flow passage more
High flowing velocity, especially near its port of export.This after and can cause inorganic matter in cooling water at these positions
Excessive erosion and precipitation (that is, precipitation and deposition) with other ingredients.
As indicated above, it may be desirable to this feature according to the present invention, the steaming generated in each cooling coil component
Vapour measurer has about 15% or smaller average value, is about 10% to about 15% on the other hand.I other words, it may be desirable to
Be transformed into each cooling coil component the cooling water inflow of steam no more than supply to the cooling coil component water about
15%, it is about 10% to about 15% on the other hand.Therefore, this feature according to the present invention, the flowing of each cooling coil
The cross-sectional area of access is selected such that, when all cut-off valves 84 are in the open position, to be transformed into steam in individual channel
Cooling water will be at a value as close possible to each other, which is about 15% or smaller, and is about 10% on the other hand
To about 15%.In this regard, the quantity of steam of generation is calculated value.
The mode for designing most of cost effectives of business acrylonitrile reactor is the pipe by same diameter to make
Make each cooling coil, and each cooling coil controlled with identical cut-off valve 84, that is, each control valve with it is other identical.Cause
This, it is ensured that the transversal of the region of the flow passage of each cooling coil is selected to realize that water is transformed into the most simple of steam in the same manner
The constriction being suitble to is is positioned in each cooling coil or at least with each cold of shorter flow passage by single mode
But in coil pipe, it may be desirable at or near its arrival end or its port of export or both.Give the relatively long of different flow passages
Degree and therefore cooling water will be present in the different time length in these different accesses, determine the accurate size of each constriction
(or if constriction is not used, determining the relative cross sectional area of flow passage) can be by conventional heat transfer calculations come easily complete
Into.
The third feature of the present invention is shown in Figure 10.In conventional design as shown in Figure 5, cooling coil 61 enters
Mouth pipeline 64 is welded directly on the reactor wall 36 of reactor 10.As indicated above, it is common practice to by independently
And it continuously periodically closes and then restarts each cooling coil to make the cooling coil of commercial propylene nitrile reactor " in turn ".When
When cooling coil is closed, temperature is quickly accumulated towards the normal operating temperature of reactor, about 350 DEG C to about 480 DEG C.So
Afterwards, when cooling coil contacts to restart by the cooling water with additional amount, temperature almost drops back to or immediately close to the cooling
The boiling point of water.The cooling can give substantive thermal stress to cooling coil 61, especially be welded to reaction in its suction line 64
The position of wall 36.Within a certain period of time, the thermal stress of the repetition can lead to the mechanical breakdown at the position.
According to the invention of this feature, which is crossed instead by the way that thermal sleeve to be mounted on to the suction line 64 of cooling coil 61
It answers and is avoided at the position of the reactor wall 36 of device 10.As shown in Figure 10, the hot jacket connected with cooling coil suction line 64
Pipe 59 is received in cooling coil inlet fitting 33, which passes through and be welded on the reactor wall 36 of reactor 10.
The outer diameter of thermal sleeve 59 is slightly less than the internal diameter of cooling coil inlet fitting 33, to limit heat space 75 therebetween, the heat space
75 are kept by shading ring 77.The outlet edge 73 of thermal sleeve 59 is simultaneously unwelded or be permanently fastened to cooler pan in other ways
On pipe fitting 33, and therefore freely moved axially relative to the cooling coil accessory.
It, in other cases will be due to appearing in the essence in cooling coil 61 when closing and restart at it using the structure
Temperature change and any thermal stress on mechanical splice between the cooling coil suction line 64 and reactor wall 36 that occur are led to
Cross thermal sleeve 59 expansion and contraction and eliminate.As a result, it can significantly avoid crossing the reactor wall 36 of reactor 10 at it
The mechanical breakdown of cooling coil 61 at position.
Another feature according to the present invention, be provided with receive across each cooling coil cooling water and steam it is cold
But water out collector is repositioned onto less than at the outlet line of each cooling coil and the position of outlet header.On the one hand,
Cooling water outlet is repositioned onto the position at the top of the cooling coil circuit less than each cooling coil.
As shown in Figure 5, in conventional design, cooling water outlet collector 82 be positioned higher than cooling water outlet pipeline 79 with
And U-bend folding accessory 63, the top of restriction cooling coil circuit 67,69 and 71.As indicated above, routine business propylene
The cooling coil of nitrile reactor periodically closes and then restarts to remove any molybdenum that may be had been deposited on its outer surface
Incrustation.When closing cooling coil, interior any cooling water is remained in since the temperature in acrylonitrile reactor is very high and quick
Evaporation.When it happens, due to not with 79 associated outlet valve of outlet line, therefore gravity cause it is cold in outlet header 82
But water is flow back by cooling coil outlet line 79 in the cooling coil of the closing.This leads to the cooling water of other additional amount
Evaporation, and the steam being therefore transformed into cooling coil.
Cooling water generally comprises the inorganic matter of dissolving and additional processing chemicals.When cooling coil is closed, this
A little inorganic matters and processing chemicals tend to be precipitated and be deposited on the inner surface of cooling coil, particularly match in lower U-bend folding
Part 62.Especially if cooling coil is closed too long, the amounts of these deposits may be substantive because this allow to come it is self cooling
But the cooling water of the substantive additional amount of water out collector 82 flows back to, and is therefore evaporated from the cooling coil of the closing.In a timing
In, this can cause the cross-sectional area of the flow passage in cooling coil to be significantly reduced (especially at these positions), this
The flow velocity across the cooling water of these positions is caused to be substantially increased.This after and can lead to the aobvious of cooling coil at these positions
It writes and corrodes, and therefore lead to premature cooling coil failure.
This feature according to the present invention, the problem is by being repositioned onto cooling water outlet collector 84 less than outlet line
79 height avoids.On the one hand, outlet header is located below the last cooling coil circuit of at least one cooling coil
Top, it more desirable to be less than the last circuit of most of or even all cooling coils.On the other hand, outlet header positions
Into the top less than all cooling coil circuits at least one coil pipe, it more desirable to be less than all in all cooling coils
The top of cooling coil circuit.See that Figure 11, Figure 11 schematically show these features.
Using the arrangement, go up due to cooling water outlet pipeline 79 and on the one hand U-bend folding accessory 63 and be positioned higher than out
Mouth collector 82 is too far and cannot cause gravity that any cooling water significantly measured is made to flow back into the cooling coil of closing, therefore basic
On fully prevent the cooling water of additional amount by gravity and from cooling water outlet collector 32 to the cooling coil of closing
Reflux.
Although only some embodiments of the present invention are hereinbefore described, it should be clear that can this hair not departed from
Many remodeling are carried out in the case of bright spirit and scope.All such remodeling are intended to be included in only to be limited by appended claims
In the scope of the present invention of system.
Claims (10)
1. a kind of cooling coil component of heat generated for removal by oxidation reactor or ammonia oxidation reactor, the cooler pan
Tube assembly includes multiple cooling coils, wherein each cooling coil includes the multiple coolings being fluidly connected in series on each other
Coil pipe circuit, to limit the cooling water path with cooling water inlet and cooling water outlet, each cooling coil circuit limits
Fixed vertically oriented cooling coil track plan, wherein each cooling coil out of described reactor towards the outer of the reactor
Week extends along corresponding vertically oriented main cooling coil plane,
At least some of the wherein at least one cooling coil cooling coil line arrangement is into causing its cooling coil circuit
Plane is at an acute angle relative to the main cooling coil plane of the cooling coil.
2. cooling coil component according to claim 1, which is characterized in that all described at least one cooling coil
Cooling coil line arrangement is into so that the main cooling coil plane of its cooling coil track plan and the cooling coil is lateral.
3. cooling coil component according to claim 1, which is characterized in that all described in all cooling coils
Cooling coil line arrangement is into so that the main cooling coil plane of its cooling coil track plan and the cooling coil is lateral.
4. cooling coil component according to claim 1, which is characterized in that the cooling coil is substantially parallel to each other,
Wherein described cooling coil component is further included for the backbar of each cooling coil, and each backbar is disposed above its phase
The cooling coil answered, the cooling coil component, which further includes, to be arranged to each cooling coil being suspended on its corresponding backbar
Cooling coil suspender.
5. cooling coil component according to claim 1, which is characterized in that the cooling coil is in every meter of reactor diameter
Including 40 to 60 cooling coil circuits.
6. a kind of for removing the process of heat generated by oxidation reactor or ammonia oxidation reactor, the process includes to cool down
Coil pack is provided to the reactor, and the cooling coil component includes multiple cooling coils, wherein each cooling coil is equal
Including the multiple cooling coil circuits being fluidly connected in series on each other, go out to limit with cooling water inlet and cooling water
The cooling water path of mouth, each cooling coil circuit limits vertically oriented cooling coil track plan, wherein each cold
But coil pipe extends out of described reactor towards the periphery of the reactor along corresponding vertically oriented main cooling coil plane,
At least some of the wherein at least one cooling coil cooling coil line arrangement is into causing its cooling coil circuit
Plane is at an acute angle relative to the main cooling coil plane of the cooling coil.
7. process according to claim 6, which is characterized in that all cooling coils at least one cooling coil
Line arrangement is into so that the main cooling coil plane of its cooling coil track plan and the cooling coil is lateral.
8. process according to claim 6, which is characterized in that all cooling coils in all cooling coils
Line arrangement is into so that the main cooling coil plane of its cooling coil track plan and the cooling coil is lateral.
9. process according to claim 6, which is characterized in that the cooling coil is substantially parallel to each other, wherein described
Cooling coil component is further included for the backbar of each cooling coil, and each backbar is disposed above its corresponding cooling
Coil pipe, the cooling coil component further include the cooler pan for being arranged to be suspended on each cooling coil on its corresponding backbar
Pipe suspender.
10. process according to claim 6, which is characterized in that the cooling coil includes 40 in every meter of reactor diameter
To 60 cooling coil circuits.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410125032.4A CN104941531B (en) | 2014-03-31 | 2014-03-31 | It is designed for the cooling coil of oxidation reactor or ammonia oxidation reactor |
| PCT/US2015/022700 WO2015153274A2 (en) | 2014-03-31 | 2015-03-26 | Cooling coil design for oxidation or ammoxidation reactors |
| JP2016559862A JP6616318B2 (en) | 2014-03-31 | 2015-03-26 | Cooling coil design for oxidation or ammoxidation reactors |
| EA201691908A EA032540B1 (en) | 2014-03-31 | 2015-03-26 | Cooling coil design for oxidation or ammoxidation reactors |
| TW104110230A TWI659187B (en) | 2014-03-31 | 2015-03-30 | Cooling coil design for oxidation or ammoxidation reactors |
| SA516371955A SA516371955B1 (en) | 2014-03-31 | 2016-09-29 | Cooling Coil Design for Oxidation or Ammoxidation Reactors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410125032.4A CN104941531B (en) | 2014-03-31 | 2014-03-31 | It is designed for the cooling coil of oxidation reactor or ammonia oxidation reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104941531A CN104941531A (en) | 2015-09-30 |
| CN104941531B true CN104941531B (en) | 2018-06-12 |
Family
ID=52998221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410125032.4A Active CN104941531B (en) | 2014-03-31 | 2014-03-31 | It is designed for the cooling coil of oxidation reactor or ammonia oxidation reactor |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP6616318B2 (en) |
| CN (1) | CN104941531B (en) |
| EA (1) | EA032540B1 (en) |
| SA (1) | SA516371955B1 (en) |
| TW (1) | TWI659187B (en) |
| WO (1) | WO2015153274A2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104941529B (en) * | 2014-03-31 | 2018-09-11 | 英尼奥斯欧洲股份公司 | It is designed for the cooling coil of oxidation reactor or ammonia oxidation reactor |
| CN104941530B (en) * | 2014-03-31 | 2018-11-16 | 英尼奥斯欧洲股份公司 | It is designed for the cooling coil of oxidation reactor or ammonia oxidation reactor |
| CN104941532B (en) * | 2014-03-31 | 2018-09-18 | 英尼奥斯欧洲股份公司 | It is designed for the cooling coil of oxidation reactor or ammonia oxidation reactor |
| CN112144054B (en) * | 2020-08-27 | 2022-12-13 | 东南大学 | Laser cladding cooling device with fin type cooling fins |
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- 2015-03-26 JP JP2016559862A patent/JP6616318B2/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2015153274A2 (en) | 2015-10-08 |
| EA032540B1 (en) | 2019-06-28 |
| CN104941531A (en) | 2015-09-30 |
| JP6616318B2 (en) | 2019-12-04 |
| TWI659187B (en) | 2019-05-11 |
| EA201691908A1 (en) | 2017-02-28 |
| TW201541048A (en) | 2015-11-01 |
| SA516371955B1 (en) | 2020-10-18 |
| JP2017512641A (en) | 2017-05-25 |
| WO2015153274A3 (en) | 2016-03-10 |
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