CN209254706U - A kind of alkylation reaction device cold shock system - Google Patents
A kind of alkylation reaction device cold shock system Download PDFInfo
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- CN209254706U CN209254706U CN201821731059.8U CN201821731059U CN209254706U CN 209254706 U CN209254706 U CN 209254706U CN 201821731059 U CN201821731059 U CN 201821731059U CN 209254706 U CN209254706 U CN 209254706U
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- cold shock
- mixer
- baffle
- alkylation reaction
- vane
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Abstract
The utility model discloses a kind of alkylation reaction device cold shock systems, close for feed pre-mixer between alkylation reaction device section, charging is remixed with reaction product.Including bushing type endless tube, cold shock mixer, baffle, choke block, vane deflector, sieve plate composition, baffle upper connecting sleeve pipe loop and choke block, baffle lower part connection cold shock mixer, sieve plate is located at cold shock mixer lower part；Bushing type endless tube is arranged symmetrically there are two gas accesses in mouth, and bushing type endless tube divides inner tube and casing, and the symmetrical aperture in outer wall of inner tube two sides, sleeve outer wall is along reactor axis cross-flow direction aperture, hole mouth face reactor center；Baffle center opens throttle orifice；Cold shock mixer is case structure, includes vane deflector.The design of the utility model structure is simple, mixes for gaseous phase materials, and fluid is uniformly mixed over time and space, and heat transfer effect is significant.
Description
Technical field
The utility model relates to the alkylation reaction devices of preparing ethylbenzene from dry gas technique, specifically, it is mixed to be related to a kind of cold and hot logistics
A kind of alkylation reaction device cold shock system of clutch-.
Background technique
Currently, catalysis drying gas process for preparing ethylbenzene technology mature application at home, reactive moieties include alkylation reaction and anti-
Alkylation reaction, wherein benzene and ethylene carry out gas phase alkylation reaction in fixed bed reactors.In patent CN200410021102.8
It mentions, enters alkylation reaction device top nozzle after the heated furnace heating of benzene, dry gas is then segmented injection, since the reaction is strongly exothermic,
During the reaction, excessively high reaction temperature is unfavorable for the activation plays of catalyst, thus utilize segmentation injection dry gas and benzene or
Product mixing, can effectively reduce temperature in device, maintain the constant of reaction bed temperature.In addition, benzene disposably enters instead
It answers at the top of device, excessive benzene is conducive to carry out one step alkylation reaction, it is possible to increase the selectivity of target product, but benzene consumption is larger.
Currently, being developed to the reactive moieties feeding manner of former catalysis drying gas ethylbenzene technology, Combinatorial Optimization Quench
When each section of temperature of charge, section isophthalic alkene air speed, have a clear superiority in terms of synergy consumption reduction, between proposition hydrocarbonylation raw material son field
The technical reform scheme of Quench.It refers specifically to, multistage insulation unstripped gas cold shock formula fixed bed reactors, benzene and dry gas divide multistage feeding, lead to
It crosses between each bed and is mixed with hydrocarbonylation product, direct cold shock hydrocarbonylation product reduces each section of reaction temperature, to realize temperature control.
This programme can effectively reduce benzene consumption, and increase vapor-phase alkylation catalyst uses the time, be more advantageous to conversion of ethylene and second
The raising of benzene selective.
Therefore, unstripped gas hybrid system, unstripped gas and reaction product mixer meaning in fixed-bed alkylation reactor are developed
It is great, improve that benzene and dry gas and the degree of mixing of reaction product, to be uniformly distributed each bed radial temperature particularly important.
Quench internals pattern is more between section in fixed bed reactors, in earlier patents CN0025391.6,
A kind of spiral-flow type cold hydrogen box is referred in CN200620162611.7, CN200620133859.0, for petrochemical plant plus
In hydrogen reactor, since hydrogen enthalpy is greater than reaction product enthalpy, both cold hydrogen and reaction product reaction product after evenly mixing
Temperature significantly reduces, and final catalyst bed radial temperature difference reduces.A kind of object is mentioned in patent CN200710122023.X
Mixing and dispensing system is flowed, a kind of aeration type chilling hydrogen case is mentioned in patent CN1765483A, mentions one kind in CN97202630.4
Chilling mixer mentions a kind of aeration type cold hydrogen box in CN1765482A, above-mentioned cold hydrogen box mostly suitable for diesel oil hydrogenation reaction,
It is roughly divided into liquid-phase collection slot, diversion trench or redistribution system, so that fluid is big as far as possible in time, space, flow pattern level, i.e., it is logical
It crosses extension runner and increases incorporation time, increase the disturbance of fluid by addition baffle, change the direction of fluid, improve gas-liquid mixed
Heat transfer efficiency afterwards.Above-mentioned cold hydrogen box has been widely used in domestic petroleum chemical plant installations, and fluid-mixing is chiefly used in gas-liquid mixed.
In the novel alkylation reaction device feed solutions of exploitation, there is not yet the research to cold shock internals between this section is reported, needle
To benzene and ethylene hydrocarbonylation gas-phase reactor, gas mixing cold shock system is designed, wherein gas-air mixer device is different from gas-
Liquid mixer explores gas-gas hybrid system, using reasonable spatial distribution, can effectively reduce bed radial temperature difference, guarantees each
The reaction temperature of catalytic bed.
Summary of the invention
The utility model proposes a kind of alkylation reaction device cold shock systems, applied to cold shock between the section of alkylation reaction device, packet
Include bushing type endless tube 1, cold shock mixer 2, baffle 3, choke block 4, vane deflector 5, the composition of sieve plate 6, it is characterised in that: baffle
3 upper connecting sleeve pipe loops 1 and choke block 4,3 lower part of baffle connect cold shock mixer 2, and sieve plate 6 is located under cold shock mixer 2
Portion；Bushing type endless tube 1 is arranged symmetrically there are two gas accesses in mouth, and bushing type endless tube 1 divides inner tube and casing, outer wall of inner tube
The symmetrical aperture in two sides, sleeve outer wall is along reactor axis cross-flow direction aperture, hole mouth face reactor center；It opens at 3 center of baffle
Throttle orifice；Cold shock mixer 2 is case structure, includes vane deflector 5.Vane deflector 5 is arranged 4-8, each vane stream
Circular hole is arranged in road end and 2 bottom of cold shock mixer.6 aperture of sieve plate arrangement, pitch of holes 50-150mm, Kong Yukong are uniformly distributed in 60 °.
Working principle process is as follows: dry gas and benzene respectively enter bushing type endless tube, after preliminary mixing in casing side opening
To reactor axial centre, reaction product is flowed from above to below for high speed injection, and product flow direction changes after meeting choke block, in pressure
Under promotion, it is introduced into throttle chamber with the high-speed gas tentatively mixed, cold shock mixer, multiply gas are then entered by throttle orifice
It contacts and remixes in the mixer, and expand along vane runner to cold shock mixer wall after deflector carries out flow homogenizing
It dissipates, vane runner extends the incorporation time of gas, and gas, which is flow at cold shock mixer wall, enters sieve plate along bottom circular aperture, most
It is redistributed eventually through sieve plate hole and enters next bed.
The advantages of the utility model includes:
1, gaseous phase materials premixing redistribution.In previous feeding manner, two kinds of materials are directly entered reactor, it is difficult to pre-
It is first uniformly mixed, on catalyst bed cross section, the concentration distribution, contact area of two kinds of materials are uneven in the same time.
The mixing that the utility model casing tube type gas endless tube both can be realized in advance, when normal operating reaction product flow direction from upper and
Under, sleeve outer wall small hole injection direction and reaction product flowing direction be in cross-flow pattern, from small hole injection go out mixed feeding with
Higher velocity disturbance reaction product enters cold shock mixer along small hole injection direction after three's mixing.The internals are with casing
Pattern, save the space of two kinds of gas feeds, the multiple mixing of gas improves heat exchange probability, reduces reaction in advance and produces
The temperature of object, and it has been pre-mixed reactant and reaction product.
2, change the flow direction of mixed gas, flow is evenly distributed.Along the injection direction of sleeve outer wall aperture, gas is through throttling
Successively enter in throttle chamber and cold shock mixer after plate baffling.Throttle orifice sectional area is throttling less than reactor cross section product, gas
Kinetic energy increases at hole, and internal fluid collision is significant, conducive to the gas mixing of cold shock internal mixer and uniformly distributed.
3, vane runner extends the mixed time.Gas after uniformly distributed diffuses into vane runner from deflector, due to stream
Road sectional area changes from small to big, and gas phase kinetic energy tends towards stability in the variation of vane tail portion, and the increase of incorporation time, which further improves, changes
Thermal effect.
4, space is saved, pressure drop is small.Bushing type endless tube is close to the baffle of cold shock mixer, and cold shock mixer height is smaller,
Incorporation time is only being increased by vane runner, entire cold shock system occupancy space reactor is small, and structure is simple, more convenient for filling
More catalyst.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Fig. 2 is the utility model cold shock system (A-A) partial cross sectional views.
Fig. 3 is part (B-B) cross section view of the utility model cold shock system.
Fig. 4 is part (C-C) cross section view of the utility model cold shock system.
Fig. 5 is the sieve plate plan view of the utility model cold shock system.
In figure 1 be the utility model structural schematic diagram, 1 is bushing type endless tube, and 2 be cold shock mixer, and 3 be baffle, and 4 are
Choke block, 5 be vane deflector, and 6 be sieve plate.
Specific embodiment
Cold shock mixer is for collecting distributing gas after gas, homogenizing, including choke block, baffle, mixer tube, vane
Deflector, sieve plate.Throttle chamber is connected and composed using four grizzly bars between choke block and baffle, it is straight that baffle diameter is equal to reactor
Diameter opens a throttle orifice at center, the hole center face choke block center and mixer center, and throttling board diameter is slightly larger than throttle orifice
Diameter；For mixer by bolt fastening under baffle, mixer diameter is smaller；Vane deflector is separately connected baffle circular hole side
Edge, baffle, mixer bottom, mixer wall erect certain space in cold shock internal mixer, and by multiple vane water conservancy diversion
Plate separates to form multiple vane runners, and runner inner section product is gradually expanded around by cold shock mixer center, and in mixer
The vane flow area maximum of bottom opens circular hole, and quantity depends on vane baffle quantity.General 4-8 block deflector is advisable,
In the space being spaced, gas flow homogenizing；Sieve plate is tightly attached to mixer bottom, and diameter is equal to reactor inside diameter, sieve
Plate uniform pore openings, angled distribution, are supported in reactor wall；The cold shock mixer is case structure, i.e., vane runner is outer
Enclose be the cold shock mixer wall.
As shown, the symmetrical aperture of 1 inner tubal wall of bushing type endless tube, dry gas sprays into casing by inner tube and mixes with benzene, through casing
Outer cinclides is sprayed along reactor axis to cross-flow direction with high flow velocities, and reaction product flows from above to below, through choke block baffling, with
Preliminary mixed gas enters the throttle chamber being made of choke block 4 and baffle 3, and final mixed gas enters cold shock mixer,
At this time since sectional area reduces suddenly, throttling action is generated, gas kinetic energy increases, and flow velocity becomes larger, and vane deflector 5 is by mixer
Space separates, and has achieved the purpose that mixed gas is evenly distributed.Gaseous mixture is spread along vane runner, due to cutting for vane runner
Area radially changes from small to big along mixer, and spatial volume also changes from small to big, conducive to the diffusion of gas, so that gas is along vane water conservancy diversion
Plate outflow, and the pressure level-off in vane flow field end, round hole is arranged in the end of vane bottom plate at this time, as much as possible
Extend the gas mixing time.
Gaseous mixture enters sieve plate redistribution via round hole, ensure that the degree of mixing of gas, avoid the occurrence of mixing it is uneven,
Phenomena such as channel, wall stream.
Claims (3)
1. a kind of alkylation reaction device cold shock system, including bushing type endless tube (1), cold shock mixer (2), baffle (3), choke block
(4), vane deflector (5), sieve plate (6) composition, it is characterised in that: baffle (3) upper connecting sleeve pipe loop (1) and choke block
(4), baffle (3) lower part connection cold shock mixer (2), sieve plate (6) are located at cold shock mixer (2) lower part；Bushing type endless tube (1) is deposited
It two gas accesses, is arranged symmetrically in mouth, bushing type endless tube (1) divides inner tube and casing, the symmetrical aperture in outer wall of inner tube two sides, set
Pipe outer wall is along reactor axis cross-flow direction aperture, hole mouth face reactor center；Open throttle orifice in baffle (3) center；Cold shock is mixed
Clutch (2) is case structure, includes vane deflector (5).
2. a kind of alkylation reaction device cold shock system according to claim 1, it is characterised in that: vane deflector (5) setting
4-8, circular hole is arranged in each vane flow field end and cold shock mixer (2) bottom.
3. a kind of alkylation reaction device cold shock system according to claim 1, it is characterised in that: sieve plate (6) aperture arrangement, hole
Spacing 50-150mm, Kong Yukong are uniformly distributed in 60 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821731059.8U CN209254706U (en) | 2018-10-25 | 2018-10-25 | A kind of alkylation reaction device cold shock system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821731059.8U CN209254706U (en) | 2018-10-25 | 2018-10-25 | A kind of alkylation reaction device cold shock system |
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| CN209254706U true CN209254706U (en) | 2019-08-16 |
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| CN201821731059.8U Active CN209254706U (en) | 2018-10-25 | 2018-10-25 | A kind of alkylation reaction device cold shock system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114950173A (en) * | 2022-05-09 | 2022-08-30 | 中国石油化工股份有限公司 | Microbubble cold hydrogen mass transfer mechanism and catalytic hydrogenation reactor |
-
2018
- 2018-10-25 CN CN201821731059.8U patent/CN209254706U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114950173A (en) * | 2022-05-09 | 2022-08-30 | 中国石油化工股份有限公司 | Microbubble cold hydrogen mass transfer mechanism and catalytic hydrogenation reactor |
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