CN110395488A - A kind of screen work Particles dispersed bed stacking method - Google Patents
A kind of screen work Particles dispersed bed stacking method Download PDFInfo
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- CN110395488A CN110395488A CN201910691080.2A CN201910691080A CN110395488A CN 110395488 A CN110395488 A CN 110395488A CN 201910691080 A CN201910691080 A CN 201910691080A CN 110395488 A CN110395488 A CN 110395488A
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- screen work
- bed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D71/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans or pop bottles; Bales of material
- B65D71/70—Trays provided with projections or recesses in order to assemble multiple articles, e.g. intermediate elements for stacking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
- B65D85/62—Containers, packaging elements or packages, specially adapted for particular articles or materials for stacks of articles; for special arrangements of groups of articles
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- Mechanical Engineering (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
Abstract
The present invention relates to a kind of screen work Particles dispersed bed stacking methods, upper layer and lower layer grid spacer and spheric granules are subjected to pre-assembled and form layers of balls entirety, then the layers of balls is integrally packed into container from level to level in container top, when screen work and particles fall, its relative position is constant, can automatically form orderly accumulation structure.Screen work Particles dispersed bed stacking method proposed by the present invention, the orderly accumulation structure of a variety of different orderly accumulation modes and a variety of gradients can be achieved, and compared with grid Particles dispersed is stacking bed, in the case where maintaining same level heat-transfer character, by rationally designing packed structures, heat transfer property is possible to be even further improved by applying coatings.
Description
Technical field
The invention belongs to porous media flows field of heat transfer, are related to a kind of composite particles orderly accumulation bed implementation method.
Background technique
Particle packing bed is widely used in catalytic reactor, in the industry such as high temperature gas cooled reactor and particle energy storage.In particle
In stacking bed, it is unordered it is stacking bed be a kind of most commonly seen mode because what this accumulation mode was randomly generated, compared to it
His accumulation mode has the advantages that at low cost.But existing research shows that due to unordered stacking bed internal particle be random distribution
, fluid is complicated and changeable in flow channel wherein, so that flow resistance is very big, will cause higher droop loss.In addition, heap
The inhomogeneities of product structure can cause the inhomogeneities of flowing heat transfer, and this aspect reduces stacking bed heat-transfer character, another
Aspect also affects the safe operation of reactor.Although therefore it is unordered it is stacking bed be widely used at present, it is not the most
Effective accumulation mode.
More and more scholars begin to focus on orderly accumulation bed in recent years.Have benefited from the regularity of packed structures, orderly ties
Flowing heat transfer characteristic in structure shows the rule of periodicity and symmetry, and inhomogeneities substantially reduces.Simultaneously to not similar shape
In the research of the orderly accumulation bed of formula, the results showed that, various forms of orderly accumulation bed accessorys have different flowing heat transfer characteristics, with
It is unordered it is stacking bed compare, what is had can substantially reduce pressure drop, and what is had can further promote exchange capability of heat.By reasonably selecting heap
The form of product bed, can be such that general flow heat transfer property is optimal.And orderly accumulation bed has centainly in industrial realization
Difficulty, laboratory often uses the technologies such as 3D printing to construct small-sized orderly accumulation bed, but this mode cost is too high, obtains and does not repay
It loses.
Calis et al. proposes a kind of compound packed structures [patent No.: US20020038066A1], this is a kind of orderly
The higher random arrangement mode of degree.Concrete methods of realizing is to fill grid channel in a reservoir first, whole container is divided
For several single channels arranged side by side, it is subsequently filled particle, so, particle random will be fallen into each single channel, be formed
Several parallel subchannels are stacking bed.The shape of each subchannel can be rectangular or trigonometric function shaped form etc..In general, each
Subchannel all has lesser caliber partial size ratio (1-2), the purpose is to the constraint using subchannel wall surface, improves in the channel
The order degree of grain arrangement, so that the pressure drop in whole container reduces.Although the compound packed structures that Calis et al. is proposed can be with
Improve particle arrangement the degree of order so that pressure drop decline, but the structure have with single pass shape and caliber partial size ratio it is close
Relationship；After the caliber partial size in single channel is than increasing, it is controllable not ensure that packed structures are ordered into.
It can be seen that high stacking bed of order degree from stacking bed several forms at present and be conducive to flowing heat transfer process,
But complete ordering is stacking bed relatively difficult to achieve, and order degree takes second place compound stacking bed can not accomplish absolutely orderly.Therefore
Lack a kind of method that can construct controllable ordered structure at present.
Summary of the invention
In order to overcome tradition unordered, orderly and compound stacking bed disadvantage, the invention proposes a kind of screen work Particles disperseds
A variety of orderly accumulation structures may be implemented that is, by the reasonable placement mode of screen work and particle in packed structures implementation method, can spirit
It is living to carry out structure design according to actual needs.
The technical scheme of the present invention is realized as follows: a kind of screen work Particles dispersed bed stacking method, characterized in that will be upper
Lower two layers of grid spacer and spheric granules carry out pre-assembled and form layers of balls entirety, then in container top that the layers of balls is one layer whole
Layer is packed into container, and when screen work and particles fall, relative position is constant, can automatically form orderly accumulation structure.Work as branch
When supportting screen work and the filling of layers of balls interval, by adjusting the characteristic size of grid spacer and support grid, can be formed has difference
Accumulation mode or with accumulation mode of the same race but different stacking bed of grain spacing.The faying face of upper layer and lower layer grid spacer is located at
There is spherical groove that is contrary, and matching with spherical particle size at the maximum gauge of spheric granules, on location hole, uses
In fixed particle position.It is also respectively provided with rotary table pit and boss on upper and lower grid spacer, forms interference fit therebetween
Relationship, after assembling with spheric granules, the relative position between particle and grid spacer determines therewith.This method is especially suitable
In container lean filling the case where.The stacking method be applicable not only to container be square tube the case where, when container be round tube or its
When his shape, it is only necessary to be cut to screen work, and in the position filler particles for having complete location hole, then according to original mode
Accumulation.
A series of screen work Particles dispersed packed structures can be designed that using above technical scheme.Beneficial effects of the present invention
It is:
1. proposing a kind of implementation method of orderly accumulation structure, such that structure-controllable is easy；
2. the orderly of different orderly accumulation mode and a variety of gradients may be implemented in the multiple-hearth stacking method proposed
Packed structures；
3. for a kind of in-line arrangement packed structures gone out designed by this method, its flowing heat transfer characteristic is calculated, and with
The single channel that Calis et al. is proposed is that the stacking bed heat-transfer character of the grid Particles dispersed of square tube compares.The result shows that this
Invent the stacking bed heat transfer property of the heat-transfer character grid Particles dispersed more highest than heat transfer coefficient of the in-line arrangement packed structures proposed
It is slightly higher, therefore by reasonably designing, the present invention is possible to obtain performance more preferably structure.
Detailed description of the invention
Fig. 1 (a) is a kind of in-line arrangement packed structures schematic three dimensional views；
Fig. 1 (b) is a kind of packed structures schematic three dimensional views of interlocking；
Schematic three dimensional views when Fig. 2 is grid spacer and unassembled layers of balls；
Fig. 3 is the two-dimensional representation of A-1 section shown in Fig. 2；
Fig. 4 is the schematic three dimensional views of A-2 section shown in Fig. 2；
Fig. 5 (a) is the schematic cross section (position including ball in in-line arrangement packed structures) of support grid；
Fig. 5 (b) is the schematic cross section (position including ball in packed structures of interlocking) of support grid；
Fig. 6 (a) is the schematic diagram of characteristic size in in-line arrangement packed structures；
Fig. 6 (b) is the schematic diagram of staggeredly characteristic size in packed structures；
Fig. 7 (a) is the round variant structure of in-line arrangement packed structures shown in Fig. 6 (a)；
Fig. 7 (b) is the round variant structure of the shown staggeredly packed structures of Fig. 6 (b).
In figure: 1- lower layer grid spacer；2- spheric granules, the upper layer 3- grid spacer；4- support grid；On 5- grid spacer
Location hole；Spherical groove on 6- grid spacer；Truncated cone-shaped boss on 7- lower layer grid spacer；On the grid spacer of the upper layer 8-
Truncated cone-shaped pit；Supported hole in 9- support grid；Unsupported hole in 10- support grid.
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Specific embodiment
Attached drawing is specific embodiments of the present invention.
As shown in Figure 1, the present invention provides a kind of implementation method of orderly particle packing bed, difference is may be implemented in this method
Orderly accumulation mode, and be not only single one kind, Fig. 1 (a) and Fig. 1 (b) give two kinds than more typical ordered structure,
It is respectively particle in-line arrangement packed structures and particle interlocks packed structures.Orderly accumulation bed implementation method proposed by the invention is:
Several spheric granules 2 are blocked with lower layer's grid spacer 1 and upper layer grid spacer 3 first, after forming layers of balls entirety, from container
Top is put into, make its under the effect of gravity free-falling to lowermost end；Then it is put into support grid 4 in container top, makes it certainly
By falling on lower layer's particle；It is put down again from container top and has used the assembled layers of balls of grid spacer, repeatedly, finally
Form screen work-Particles dispersed orderly accumulation bed.It can be seen that stacking method proposed by the invention can by grid spacer with
The pre-assembled of spheric granules, so that the automatic realization of orderly accumulation bed becomes possible.In addition, in this configuration, tune can be passed through
Parameter size in whole grid spacer and support grid realizes different accumulation modes.
Fig. 2,3,4 schematic three dimensional views and two diagrammatic cross-sections when being grid spacer and unassembled layers of balls.As seen from the figure,
There is location hole 5 on upper and lower grid spacer, there is the spherical groove 6 to match with spherical particle size, and direction on each location hole 5
On the contrary, its faying face is located exactly at the maximum gauge of ball, to fix particle.In addition, being provided on lower layer's grid spacer
Truncated cone-shaped boss 7 is provided with inverted round stage pit 8 on the grid spacer of upper layer, forms interference fit relation therebetween, when spherical
After grain is assembled with upper and lower grid spacer, three forms an entirety, and the position of ball is fixed therewith；Even if when container lean,
The relative position of the position and grid spacer that can still guarantee particle is constant.
Fig. 5 is the schematic cross section of support grid 4, also illustrates ball in in-line arrangement packed structures using dotted line in Fig. 5 (a)
The largest contours of shape particle illustrate the largest contours of spheric granules in staggeredly packed structures in Fig. 5 (b).Referring to Fig. 5 (a) institute
Show, in support grid 4 from container top dropping process, when the bottom surface of the supported hole 9 on support grid connects with spheric granules
After touch, support grid no longer falls.When putting into grid spacer and the assembled layers of balls of spheric granules again in container top, and should
Layers of balls is identical as first layer layers of balls, then the upper surface that new layers of balls can be supported hole 9 is held, and thus automatically forms in-line arrangement accumulation knot
Structure.In in-line arrangement packed structures, upper layer particle is in contact with supported hole 9 with lower layer's particle, and unsupported hole 10 is only used as fluid
Channel.
Referring to shown in Fig. 5 (b), when location hole in the position of location hole in second layer grid spacer and first layer grid spacer
Position just staggeredly when, then second layer club is fallen into just in the supported hole 10 of support grid 4, formed interlock packed structures.
It is the profile of second layer ball than the spheric profile that Fig. 5 (a) has more in Fig. 5 (b).In staggeredly packed structures, lower layer's particle with
The lower end face contact of unsupported hole 10, the upper end face contact of upper layer particle and supported hole 9.
Fig. 6 (a) and Fig. 6 (b) be respectively in-line arrangement packed structures and staggeredly in packed structures screen work characteristic parameter schematic diagram.
Illustrate how to change by the adjustment of parameter size in grid spacer and support grid accumulation below with reference to Fig. 6 (a) and (b)
Structure.Referring to shown in Fig. 6, upper and lower grid spacer is of the same size on cross section, and the width of screen work item is w1, location hole
The a length of w of inner edge3, the distance between two location holes are w2, upper and lower grid spacer can have different height, respectively h2
And h1；The width of screen work item is w in support grid5, a length of w of the inner edge of supported hole4, a length of w of the inner edge of unsupported hole6, height
For h4；The distance between upper grid spacer top and support grid bottom end are h3.Since the location hole of upper and lower grid spacer needs card
Firmly particle, therefore screen work width w1With positioning hole side length w3The sum of (2w1+w3) particle diameter d need to be greater thanp, while w3It is less than
dp；In order to guarantee that fluid has enough flowing spaces, w3It is slightly less than dp；w2For adjusting in same layers of balls between particle
Spacing.In in-line arrangement packed structures, the upper and lower end face of supported hole is tangent with upper and lower layers of balls respectively in support grid, characteristic parameter
Between should also meet following relationship:
In staggeredly packed structures, the lower end surface of unsupported hole and lower layer ball are tangent in support grid, the upper end of supported hole
Face and upper layer ball are tangent, and the relationship for also needing to meet between characteristic parameter is as follows:
It is worth noting that it is not limited to every layer of parameter having the same by packed structures designed by this method, it can root
Axially varying screen work parameter is designed according to axial flowing heat transfer situation.In addition, complex ordered accumulation proposed by the invention
Bed implementation method is applicable not only to the case where container is square tube, in the container of other shapes, it is only necessary to according to container shapes pair
Screen work is cut, then the wherein complete populated particle of screen work location hole again, and completes one layer of ball, one layer of separation screen work
Put.More intuitive, Fig. 7 (a) and (b) respectively show the in-line arrangement packed structures formed in round tube and staggeredly heap
Product structure.
The present invention also uses method for numerical simulation to the flowing heat transfer characteristic of the screen work Particles dispersed packed structures proposed
It is studied, and the characteristic stacking bed with grid Particles dispersed that Calis et al. is proposed is compared.Herein, due to
In the structure that Calis et al. is proposed, single channel caliber partial size ratio is that the structure of 1 (N1) possesses highest complex heat transfer performance,
Therefore the structure is chosen here as comparison other.Simultaneously as the present invention provides the implementation of a variety of orderly accumulation beds,
Here selection and the closest one kind of N1 structure, facilitate comparison.Grid spacer thickness is up and down in selected structure
1mm, support grid with a thickness of zero (corresponding upper and lower level ball contacts with each other)；Its particle diameter and N1's is consistent.
It is computed, find patent structure is higher than N1 along Cheng Pingjun mainstream speed, illustrates washing away for fluid with solid surface
More strong, this is conducive to improve convective heat-transfer coefficient.Dimensionless convective heat transfer of both structures under different entrance velocities
Coefficient Nu is as shown in the table, it can be seen that compared to traditional structure, Nu, which truly has, to be mentioned patent structure proposed by the invention
It is high.
| Entrance velocity v (m/s) | Reynolds number Rep | The Nu of structure of the invention | The Nu of N1 |
| 1 | 685 | 27.44 | 27.46 |
| 2 | 1370 | 47.15 | 42.10 |
| 3 | 2054 | 64.40 | 54.32 |
In addition, if changing the accumulation mode of orderly accumulation bed proposed by the invention or screen work parameter, heat transfer property are expected to
It further increases.In conclusion the present invention provides not only a kind of implementation method of orderly accumulation bed, also passed to further increase
The flowing heat transfer characteristic of system orderly accumulation bed provides possibility.
Claims (5)
1. a kind of screen work Particles dispersed bed stacking method, which is characterized in that carry out upper layer and lower layer grid spacer and spheric granules
Pre-assembled forms layers of balls entirety, the layers of balls is integrally then packed into container from level to level in container top, when under screen work and particle
When falling, relative position is constant, can automatically form orderly accumulation structure.When support grid and layers of balls interval are filled, pass through
Adjust grid spacer and support grid characteristic size, can be formed with different accumulation modes or have accumulation mode of the same race but
Different stacking bed of grain spacing.
2. a kind of screen work Particles dispersed bed stacking method according to claim 1, it is characterised in that: upper layer and lower layer positioning
The faying face of screen work is located at the maximum gauge of spheric granules, have on location hole it is contrary, and with spherical particle size phase
Matched spherical groove, for fixing particle position.
3. a kind of screen work Particles dispersed bed stacking method according to claim 1, it is characterised in that: upper and lower grid spacer
On be also respectively provided with rotary table pit and boss, form interference fit relation therebetween, after being assembled with spheric granules,
Relative position between grain and grid spacer determines therewith.This method is particularly suitable for the case where container lean filling.
4. a kind of screen work Particles dispersed bed stacking method according to claim 1, it is characterised in that: this method is not only fitted
The case where for container being square tube, when container is round tube or other shapes, it is only necessary to be cut to screen work, and complete having
The position filler particles of location hole, then accumulate according to original mode.
5. a kind of screen work Particles dispersed is stacking bed, it is characterized in that: using such as screen work particle of any of claims 1-4
Multiple-hearth stacking method is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910691080.2A CN110395488B (en) | 2019-07-30 | 2019-07-30 | Grid particle composite bed stacking method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910691080.2A CN110395488B (en) | 2019-07-30 | 2019-07-30 | Grid particle composite bed stacking method |
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| CN110395488A true CN110395488A (en) | 2019-11-01 |
| CN110395488B CN110395488B (en) | 2020-07-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503971A (en) * | 2020-12-07 | 2021-03-16 | 西安交通大学 | Heat transfer device is piled up in order to dysmorphism granule |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2090288U (en) * | 1991-05-16 | 1991-12-11 | 清华大学 | Column extractor with cellular-type grid regular packing |
| DE29801304U1 (en) * | 1998-01-28 | 1998-05-07 | Norddeutsche Seekabelwerke GmbH, 26954 Nordenham | Device for the biological treatment of waste water in particular |
| WO1999025650A1 (en) * | 1997-11-19 | 1999-05-27 | Imperial Chemical Industries Plc | Ammonia oxidation catalysts |
| CN201470393U (en) * | 2009-07-30 | 2010-05-19 | 杭州华纳塔器科技有限公司 | Grid packing and packing structure |
| CN102225322A (en) * | 2011-04-12 | 2011-10-26 | 纪群 | Reactor with interval filling bed |
-
2019
- 2019-07-30 CN CN201910691080.2A patent/CN110395488B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2090288U (en) * | 1991-05-16 | 1991-12-11 | 清华大学 | Column extractor with cellular-type grid regular packing |
| WO1999025650A1 (en) * | 1997-11-19 | 1999-05-27 | Imperial Chemical Industries Plc | Ammonia oxidation catalysts |
| DE29801304U1 (en) * | 1998-01-28 | 1998-05-07 | Norddeutsche Seekabelwerke GmbH, 26954 Nordenham | Device for the biological treatment of waste water in particular |
| CN201470393U (en) * | 2009-07-30 | 2010-05-19 | 杭州华纳塔器科技有限公司 | Grid packing and packing structure |
| CN102225322A (en) * | 2011-04-12 | 2011-10-26 | 纪群 | Reactor with interval filling bed |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503971A (en) * | 2020-12-07 | 2021-03-16 | 西安交通大学 | Heat transfer device is piled up in order to dysmorphism granule |
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|---|---|
| CN110395488B (en) | 2020-07-14 |
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