CN109967004A - A kind of fluidized-bed reactor of augmentation of heat transfer - Google Patents
A kind of fluidized-bed reactor of augmentation of heat transfer Download PDFInfo
- Publication number
- CN109967004A CN109967004A CN201910185987.1A CN201910185987A CN109967004A CN 109967004 A CN109967004 A CN 109967004A CN 201910185987 A CN201910185987 A CN 201910185987A CN 109967004 A CN109967004 A CN 109967004A
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- Prior art keywords
- fluidized
- heat transfer
- bed reactor
- augmentation
- distribution grid
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- 230000003416 augmentation Effects 0.000 title claims abstract description 15
- 238000009826 distribution Methods 0.000 claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 239000007787 solid Substances 0.000 claims abstract description 18
- 239000007791 liquid phase Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000012071 phase Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 3
- 239000003960 organic solvent Substances 0.000 claims description 3
- 208000035126 Facies Diseases 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000003980 solgel method Methods 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 238000009987 spinning Methods 0.000 claims description 2
- 238000005530 etching Methods 0.000 claims 1
- 125000001153 fluoro group Chemical group F* 0.000 claims 1
- 230000008020 evaporation Effects 0.000 abstract description 7
- 238000001704 evaporation Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 241000521257 Hydrops Species 0.000 abstract description 5
- 206010030113 Oedema Diseases 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 4
- 238000009825 accumulation Methods 0.000 abstract description 2
- 238000005054 agglomeration Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 abstract description 2
- 239000002344 surface layer Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 24
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 244000020998 Acacia farnesiana Species 0.000 description 3
- 235000010643 Leucaena leucocephala Nutrition 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000007792 gaseous phase Substances 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000010329 laser etching Methods 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000000126 substance Substances 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
Abstract
The invention discloses a kind of fluidized-bed reactors of augmentation of heat transfer, pass through the excessive heat for spraying into condensate liquid into fluidized bed to generate during absorbing reaction.To avoid hydrops accumulation from causing the influence to production stability, the gas distribution grid which uses resistant to liquids to deposit, and specially treated is carried out on fluidized bed wall.The distribution plate surface and fluidizer wall surface are the solid surface layer of super lyophoby, condensate liquid into reactor is dispersed in distribution plate surface and wall of reactor surface in the form of drop, increase the specific surface area of liquid phase, the evaporation rate and rate of heat transfer for improving drop solve the problems, such as in the prior art because of distribution grid air inlet hole plug caused by hydrops and the agglomeration of solid particle agglomerate.
Description
Technical field
The present invention relates to a kind of fluidized-bed reactor of augmentation of heat transfer more particularly to a kind of gases of fluidized-bed reactor point
Fabric swatch.
Technical background
Fluidized-bed reactor is widely used in various industrial productions due to mass transfer with higher and heat transfer efficiency
In.In some production technologies, since exothermic heat of reaction effect is stronger, only taking heat out of by wall heat transfer and fluidized gas cannot be tieed up
Hold suitable operation temperature.To realize that this part reaction is operated in a fluidized bed reactor, by fluidized bed
The condensate liquids such as middle penetrating organic solvent, latent heat needed for being evaporated by condensate liquid absorb extra heat.
In existing condensation technology, after condensate liquid introduces reactor, drop is easy to be covered on distribution plate surface and fluidized bed
Liquid film is formed on inner wall, when there is local uneven penetrating during spraying condensate liquid, hydrops phenomenon is particularly acute.By
Smaller in liquid film specific surface area, liquid film evaporation rate is slower.When liquid film is covered on distribution grid upper surface and inner wall, increase
Heat transmission resistance reduces fluidized bed and extraneous heat transfer efficiency.Simultaneously as the presence of liquid makes solid particle in fluidized bed
Between reunite because of liquid bridge power, cause these particles bonding blocking, and block the air inlet of distribution grid, lead to the resistance of distribution grid
Increase, totally unfavorable influence is generated to the operation of fluidized bed.
Therefore, exploitation new gas distribution grid with solve inner wall liquid film accumulation and distribution grid air inlet blockage problem,
For stablizing industrial production, improves polyethylene product quality and be of great significance.
Summary of the invention
The object of the present invention is to provide a kind of fluidized-bed reactor of augmentation of heat transfer, schematic diagram is as shown in Figure 1.To overcome
The defect of the prior art, the technology used in the present invention means are:
In fluidized bed reaction zone, side wall is provided with nozzle as liquid phase feeding mouth.It is sprayed by nozzle into fluidized bed corresponding
Condensate liquid.Heat is absorbed when condensate liquid evaporation, excessive heat takes out of in realization reactor.Nozzle can be ellipse spray
Mouth, square nozzle, Solid cone nozzle, fan nozzle.Nozzle quantity is no less than 1.
The surface of solids of one layer of super lyophoby is coated in the inner wall of fluidized-bed reactor and gas distribution grid upper surface, with reality
The quickening of existing condensate liquid hydrops additional issue rate.
Conventionally, as liquid film specific surface area is smaller, liquid film evaporation rate is slower.To realize liquid film evaporation rate
Enhancing, make hydrops by changing the way of contact between reactor surface and liquid film a drops exist on the surface, increase
Add the specific surface area of liquid, increases liquid film evaporation rate.
The surface of solids of super lyophoby used in this patent and the advancing contact angle of condensate liquid are greater than 140 °, receding contact angle
Greater than 135 °.
Further, the super lyophoby surface of solids is special construction, is arranged in distribution grid upper surface structure by several structural units
At.The shape of above structure unit can be cone or cylinder, and the bottom surface of centrum or one of bottom surface of cylinder and gas divide
Fabric swatch upper surface is connected.
Further, the height of structural unit is 100 μm~800 μm, preferably 800 μm；Facies basialis pyramidis diameter is preferred
For 10 μm~90 μm, preferably 90 μm.The expanding ratio preferably 0.05~0.2 of cone；Structural unit spacing is preferably 10 μm~
400 μm, preferably 200 μm.
Centrum or cylinder are preferably arranged vertically, and arrange rectangular, rectangular or circular array in distribution grid upper surface.
Another object of the present invention is to provide a kind of preparation methods of above-mentioned super lyophoby surface of solids.Preparation method can be
Phase disengagement method, stencil methods, shop spinning, sol-gel method, template-based extrusion method, laser and plasma etching method stretch
One of method or etch.Further, preparing solvent used in the super lyophoby surface of solids can be fluorine-containing organic solvent.
Analyzed the super lyophoby property realization principle on the super lyophoby surface as shown in Figure 1: condensate liquid in the form of drop
Super lyophoby surface spreading.Compared with membranaceous on distribution grid of liquid, the drop-wise mode in super lyophoby distribution plate surface has height
The heat transfer efficiency of an order of magnitude out.Drop under the effect of gravity, to structural unit intermittent motion, due to structural unit gap compared with
Small, liquid phase is shot back grid surface under the action of capillary force, the contact condition between drop and wall surface from Wenzal state to
The conversion of Cassie state.
Compared with prior art, the present invention have it is following the utility model has the advantages that
Using the material of specially treated as distribution plate surface and reaction gas inner wall, condensate liquid disperses in droplets
On surface, and the wetting state of drop is made to be the Cassie mode being suspended in structure rather than be trapped in the Wenzel in structure
Mode greatly increases the specific surface area of liquid phase, improves rate of heat transfer, solves distribution grid air inlet to a certain extent
The problem of blocking, is conducive to the long period operation of commercial plant.
Detailed description of the invention
Fig. 1 is the fluidized-bed reactor schematic diagram of augmentation of heat transfer
In Fig. 2, (a) is the schematic diagram of Wenzal wetting state, (b) is the schematic diagram of Cassie wetting state；
Fig. 3 is the super lyophoby surface of solids structural schematic diagram of gas distribution grid upper surface；
Fig. 4 is the structural schematic diagram of gas distribution grid (small circle is air inlet).
In figure, 1- gas-phase feed mouth；2- liquid phase feeding mouth；3- gaseous phase outlet；The 4- side wall super lyophoby surface of solids；5- gas
Distribution grid.
Specific embodiment
Specific embodiments of the present invention are described further below in conjunction with attached drawing.It should be noted that these realities
The explanation for applying example is used to help understand the present invention, but and does not constitute a limitation of the invention.Furthermore.Invention described below
Involved technical characteristic can be combined with each other as long as they do not conflict with each other in each embodiment.
It is as shown in Figure 1 the schematic diagram of the fluidized-bed reactor of augmentation of heat transfer of the invention, fluidized-bed reactor has gas
Phase feed inlet 1 and gaseous phase outlet 3；Fluidized-bed reactor is provided with liquid phase feeding mouth 2 in fluidized-bed reactor side wall；The fluidisation
5 upper surface of gas distribution grid of bed reactor and wall of reactor inner surface have the surface of solids 4 of super lyophoby.
Embodiment 1
A kind of gas distribution grid of resistant to liquids deposition described in Fig. 2, gas distribution grid are equipped with air inlet, and percent opening
It is 5%.The upper surface of gas distribution grid is dripped polyvinyl alcohol in gas distribution grid upper surface using template-based extrusion method, is obtained after dry
To lyophobic surface.Square grid is obtained followed in turn by wire cutting machine.As shown in figure 3, after special processing, in gas distribution grid
Upper surface forms a kind of special construction, i.e., the similar side centrum of a large amount of geomeries is closely arranged in array-like.The present embodiment
In, the height of each cone is 800 μm, and the upper surface diameter of a circle of pyramidal structure unit is from top to down by 20 μm to 90 μm linear increasings
Add, center is away from 200 μm.Square cone top part generates nanometer decorative pattern using chemical corrosion method, and nanostructure decorative pattern average diameter is 3 μm.
Wherein its shape can be pyramid, cylinder or prism etc.；The size of structural unit can be 100 μm~800 μm adjustings, cone in height
The upper surface diameter of a circle of shape structural unit can be 10 μm~50 μm, and the expanding ratio of pyramidal structure unit can be 0.05~0.2,
Structural unit spacing can be 10 μm~400 μm.
After tested, advancing contact angle θ of the condensate liquid on the gas distribution gridadv=168 ° ± 2 °, receding contact angle θrec
=160 ° ± 2 °, this shows that the structure has good super lyophoby property, produces a desired effect.
Embodiment 2
Embodiment 2 is application of the fluidized-bed reactor in polyethylene production process of augmentation of heat transfer.To fluidized bed inner wall
After carrying out super lyophoby processing using production method described in embodiment 1 with gas distribution grid, operated under frozen state, production line
Property low density polyethylene (LDPE), and its actual performance is tested, it is as a result as follows:
1) linear low density polyethylene product operation data
Reaction raw materials: ethylene, 1- butylene, hydrogen
Condensate liquid volume content in circulating air: 5-6%
2) continuous operation 18 months the case where
Circulating air and condensate liquid stability of flow, without obvious wave phenomenon, gas distribution grid pressure difference shows gas without phenomenon is increased
Body distribution grid is without clogging.
3) the inspection situation after continuous operation 24 months:
Soilless sticking particle and agglomeration on gas distribution grid, without powder deposition, adherency situations such as, distribution grid is clean, gas point
Fabric swatch surface grid structure is not destroyed, 856 on gas distribution grid 1Air inlet without blocking, as shown in Figure 4.
The result shows that being produced using fluidized-bed reactor of the invention, the operational issue of production run is not detected
With the adverse effect of product.Liquid film is dispersed in gas distribution grid surface in droplets, since specific surface area is smaller, evaporation speed
Rate is very fast, to solve the problems, such as that polymer powders block gas distribution grid air inlet, the period of fluidized bed steady production is mentioned
Height, can be with safe and stable operation under conditions of guaranteeing that circulating flow rate is constant.
Claims (7)
1. a kind of fluidized-bed reactor of augmentation of heat transfer, which is characterized in that described that fluidized-bed reactor side wall is provided with liquid phase
Feed inlet；The gas distribution grid upper surface of the fluidized-bed reactor and wall of reactor inner surface have the solid table of super lyophoby
Face；The surface of solids of the gas distribution grid super lyophoby is arranged in distribution grid upper surface by several structural units and constitutes.It is described
Structural unit shape be cone or cylinder；The height of the structural unit is 100 μm~800 μm；The facies basialis pyramidis
Diameter is 10 μm~90 μm, and the expanding ratio of cone is 0.05~0.2, and structural unit spacing is 10 μm~400 μm.
2. a kind of fluidized-bed reactor of augmentation of heat transfer as described in claim 1, which is characterized in that the reactor liquid phase into
Material mouth is provided with nozzle, and the quantity of liquid phase feeding mouth is not less than 1.
3. a kind of fluidized-bed reactor of augmentation of heat transfer as described in claim 1, which is characterized in that the nozzle can be ellipse
Round nozzle, square nozzle, Solid cone nozzle, fan nozzle.
4. a kind of fluidized-bed reactor of augmentation of heat transfer as described in claim 1, it is characterised in that the solid of the super lyophoby
The advancing contact angle of surface and condensate liquid is greater than 140 °, and receding contact angle is greater than 135 °.
5. a kind of fluidized-bed reactor of augmentation of heat transfer as described in claim 1, which is characterized in that the structural unit exists
Distribution grid upper surface arranges rectangular, rectangular or circular array.
6. a kind of fluidized-bed reactor of augmentation of heat transfer as described in claim 1 or 4, which is characterized in that super lyophoby solid table
The preparation method in face be phase disengagement method, stencil methods, shop spinning, sol-gel method, template-based extrusion method, laser and wait from
One of daughter etching method, pulling method or etch are a variety of.
7. a kind of fluidized-bed reactor of augmentation of heat transfer as claimed in claim 6, which is characterized in that the super lyophoby solid
Solvent used in the preparation method on surface is fluorine-containing organic solvent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910185987.1A CN109967004A (en) | 2019-03-12 | 2019-03-12 | A kind of fluidized-bed reactor of augmentation of heat transfer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910185987.1A CN109967004A (en) | 2019-03-12 | 2019-03-12 | A kind of fluidized-bed reactor of augmentation of heat transfer |
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| Publication Number | Publication Date |
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| CN109967004A true CN109967004A (en) | 2019-07-05 |
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|---|---|---|---|
| CN201910185987.1A Pending CN109967004A (en) | 2019-03-12 | 2019-03-12 | A kind of fluidized-bed reactor of augmentation of heat transfer |
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