CN111375227A - Ecological geometry self-expanding structure simulated moving bed - Google Patents

Abstract

The invention relates to an ecological geometry self-expanding structure simulated moving bed, wherein a central column and a plurality of layers of grating layers which are distributed up and down are arranged in a tower body, a space for forming an adsorption bed layer is reserved between every two adjacent grating layers, the central column is in a regular hexagonal prism shape, the grating layers are horizontally arranged, 6 radial grating strips which are distributed at equal angular intervals are arranged on the same grating layer, tangential grating strips are distributed between every two adjacent radial grating strips, two ends of each radial grating strip are respectively supported on a supporting ring of the central column and the tower body, two ends of each tangential grating strip are respectively connected with a frame of the corresponding radial grating strip, the tangential grating strips and the radial grating strips are spliced into a complete grating layer together, and the radial grating strips and the tangential grating strips are formed pieces. According to the invention, by optimizing the distribution structure of the process materials, the distribution uniformity is improved, and the processing and the assembly are convenient.

Description

Ecological geometry self-expanding structure simulated moving bed

Technical Field

The invention relates to an ecological geometry self-expanding structure simulated moving bed.

Background

The Simulated Moving Bed (SMB) technology is a novel modern separation technology developed on the basis of a Moving Bed, has the advantages of strong separation capacity, small equipment structure, low adsorbent consumption, large mass transfer driving force, low investment and operation cost, convenience for automatic control, easiness in separating a thermosensitive material system and a material system which is difficult to separate and the like, and is widely applied to petrochemical industry, fine chemical industry, biological medicine and food industry in the last decade.

A simulated moving bed generally adopts a vertical shell (or called a tower body), the shell is sequentially divided into a plurality of beds along the axial direction, corresponding adsorbents are filled in the beds, each bed is provided with a material inlet pipe and a material outlet pipe which are independently controlled, the continuous movement of a solid phase adsorbent is simulated by utilizing the sequential switching of liquid phase materials entering and exiting the adsorption beds under the program control, namely, the relative movement of the solid phase and the liquid phase is realized by continuously switching the positions of material inlet and outlet in a device, so that the problems of inconvenient operation, adsorbent abrasion, easy pipeline blockage by powder, difficult uniform flow, unsatisfactory adsorption effect and the like of a large amount of solid adsorbents generated by a moving bed process when the solid adsorbents circularly move inside and outside the beds are solved, the advantages of a fixed bed are realized between two times of switching, the characteristic of continuous countercurrent moving bed operation is kept in the continuously switching process, and SMB adsorption and separation operation is a semi-continuous operation process in, and it only simulates the movement of the fixed phase, so there is no abrasion of the adsorbent, and at the same time, it can exert the advantages of continuous operation, large treatment capacity, high product purity and recovery rate, etc.

The main defects of the existing SMB are that the feeding distribution and the discharging collection are realized by adopting a pipeline distributor generally, but the pipeline distributor is difficult to realize ideal uniform distribution and influences the stability of the adsorbent of a bed layer. An improved thought is that a fluid (process material) distribution device is arranged between beds (or above and below the beds), the whole flow surface (cross section) is divided into a plurality of small areas through partition plates, and each small area is provided with an independent feeding and discharging branch pipe for feeding and discharging so as to reduce the nonuniformity caused by overlarge area.

The separation of the small regions can be performed in various ways. For example, a radial partition plate (along the radius direction of the cross section of the tower body) is adopted to divide the whole flow passing section into a plurality of fan-shaped areas with equal size; or the cross baffle plates are adopted to divide the flow surface into a plurality of rectangular areas. However, the separation methods have the problems of uneven fluid distribution, complicated mounting and dismounting processes and the like. For example, the sector area has good symmetry, but because the length and width of the two ends of the sector structure are greatly different, even if the material flow connection pipe is positioned at the geometric center of the sector, the fluid distribution effect is still poor, which easily causes the fluid to be unevenly distributed in the grid, and finally causes the inconsistent adsorption degree of the adsorbent at the lower layer; in addition, the length of the fan-shaped structure is long, the structure leads to long retention time of liquid in the grid block, the pressure drop of logistics entering and exiting the grid is large, the concentration gradient is easy to appear, and the stable operation and energy conservation of the whole bed layer are not facilitated. For another example, the rectangular partition mode is simple, but a plurality of support beams and secondary support beams are required to be arranged, and the symmetry is not good. The distances from the distribution header pipes of the material flow to the rectangular areas are inconsistent, which easily causes uneven flow distribution and inconsistent pressure drop of the fluid in each area, and finally causes inconsistent adsorption degree of the adsorbent at the lower layer, thus causing larger pressure drop of the material flow entering and exiting the grids and easy concentration gradient, and being not beneficial to stable operation and energy conservation of the whole bed layer; in addition, the arrangement of a considerable number of supporting beams in the structure increases the load of the adsorption tower, so that the processing cost of the tower body is increased; the regional specifications are not uniform, and the specification quantity is large, so that the processing cost of the distribution device is increased, and the difficulty in mounting and dismounting is increased.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the ecological geometry self-expansion structure simulated moving bed so as to optimize the fluid (process material) distribution structure, improve the distribution uniformity and facilitate the arrangement of a distribution device.

The technical scheme of the invention is as follows: ecological geometry is from extending structure simulated moving bed, including the tower body, be equipped with the multilayer grid layer that is located the center post on the tower body axis and distributes from top to bottom in the tower body, leave the space that constitutes the adsorption bed layer between the adjacent grid layer, the adsorption bed layer is the multilayer, the appearance of center post is regular hexagonal prism shape, grid layer level sets up, comprises a plurality of grid bars of closely arranging on same horizontal plane, grid bar comprises one or more grid unit, including radial grid bar and tangential grid bar, grid unit is regular hexagonal cylindric, is equipped with six frames, works as grid bar contains a plurality of grid units, grid unit linear arrangement, and adjacent grid unit is total wall (through sharing same frame and interconnect as an organic whole), and radial grid bar on the same grid layer is 6, and the equiangular distance distributes, radial grid bar is along the radial of tower body (the radius direction of tower body cross section or cross the tower body cross section's of central point radius direction of tower body Horizontal straight line direction), the inner end of the vertical grid bar is opposite to one outer side face of the central column and is supported on the central column, the outer end of the vertical grid bar is supported on the tower body, the tangential grid bars are arranged along the tangential direction of the tower body (the horizontal direction which is vertical to the radial direction of the tower body at the central point of the tangential grid bars), the vertical grid bar is filled in the area between the adjacent radial grid bars, the end parts of the vertical grid bars are connected with the frames of the radial grid bars at the corresponding parts, and the vertical grid bars and the radial grid bars are spliced together to form a complete.

The central column and the tower body can be provided with supporting structures for supporting the radial grid bars.

The support structure of the central column is preferably a horizontal outer support ring fixedly arranged on the outer side of the support structure, the support structure of the tower body is preferably a horizontal inner support ring fixedly arranged on the inner side of the support structure, and two ends of the radial grid bars are respectively supported on the upper surfaces of the inner support ring and the outer support ring.

And a fixed connecting structure or a fixed connecting piece is arranged or not arranged between the inner end of the radial grid bar and the corresponding inner support ring.

And a fixed connecting structure or a fixed connecting piece is arranged or not arranged between the outer end of the radial grid bar and the corresponding outer supporting ring.

The radial grid bars and the tangential grid bars are preferably integrally formed parts.

The radial grid bars, the central column and the tower body are connected together to form a support framework of a grid layer, and side frames of the radial grid bars form support pieces of corresponding tangential grid bars.

On the same grid layer, the splicing mode (or distribution) of the grid bars is usually that adjacent side frames of adjacent grid units are opposite, namely, the frames are opposite to the frames, so that a honeycomb-shaped close splicing mode is formed.

The outer ends of the radial grid bars are preferably provided with a half-grid-unit-shaped lap joint structure for supporting on the supporting structure of the tower body and realizing connection with the corresponding frame of the tangential grid bar at the outermost side.

The tangential grid bars and the corresponding radial grid bars can be connected in a clamping groove mode, clamping groove structures which extend outwards and are provided with downward openings are arranged at the tops of end frames, opposite to the radial grid bars, of the tangential grid bars, the clamping groove structures are buckled on the corresponding frames of the radial grid bars, and the outer walls of the clamping groove structures are clamped on the inner sides of the corresponding frames of the radial grid bars.

The connection mode between tangential grid bars and corresponding radial grid bars can be for reserving the welded plate and connecting, the bottom of the tip frame relative with radial grid bars on the tangential grid bars is equipped with the horizontally that outwards stretches out and reserves the welded plate, reserve the welded plate with the bottom welding of the corresponding frame of radial grid bars is in the same place.

Preferably, the radial grid bars comprise 3 complete grid units, three tangential grid bars are arranged between any adjacent radial grid bars, and from inside to outside, the three tangential grid bars are respectively 1 unit grid bar consisting of 1 grid unit, 2 unit grid bars consisting of 2 grid units and 3 unit grid bars consisting of 3 grid units.

Preferably, each grid layer is provided with a respective multi-stage distribution piping.

Preferably, the corresponding (connecting) relationship between the upper-level distribution pipes and the lower-level distribution pipes of the multi-level distribution pipe system is one-to-many, and the number of the grid units corresponding to each distribution pipe of the same level is the same.

The invention has the following beneficial effects:

1) by adopting a partition mode (grid unit) of a regular hexagon, the characteristics of complete filling and the highest efficiency of the hexagon are fully utilized, the dual advantages of completely filling the flow plane and having the largest area under the same perimeter are achieved, and the technical effects of compact structure, uniform distribution, good stress buffering effect, high modularization degree, good self-supporting effect and the like of a large-diameter bed layer plane can be achieved.

2) By arranging the long column with the regular hexagonal section as a central support body and sequentially performing outward radial expansion as the center, the frame of the main beam grid forming piece is used as a supporting stress point of other grid forming pieces, no additional cross beam is needed, the self-supporting of the grid is realized, the tower body load is effectively reduced, the bed layer flow sectional area is increased, and the supporting structure is simplified.

3) The grid subregion is even, and the circulation route length of fluid from the center to the edge is unanimous in the grid, and the distribution uniformity degree is better, can show the separation efficiency who improves simulated moving bed, compares in traditional technique more energy-conserving high-efficient.

4) The deformation trend caused by uneven stress is avoided, the whole bed layer section has better stress buffering, and the structure is more stable.

5) The multistage liquid distribution pipes enable liquid paths of all the partitions to be the same and resistance to be the same, and consistency of flow of all the partitions is guaranteed.

6) The tangential grid bars and the frames of the radial grid bars are connected by clamping grooves and/or reserved welding plates, so that the on-site assembly and disassembly are facilitated.

7) The grid used as the distribution device is assembled by adopting the formed parts, the processing modularization degree is high, and the processing difficulty and the processing cost are greatly reduced.

The invention can be used for C5-C20, light aromatic hydrocarbon separation, heavy aromatic hydrocarbon separation, alkane-alkene and alkene separation and the like.

Drawings

FIG. 1 is a schematic diagram of the structure of a moving bed;

FIG. 2 is a schematic view of the structure of a grid layer;

FIG. 3 is a schematic perspective view of a grid layer support structure;

FIG. 4 is a schematic view of a layered arrangement of radial grid bars;

FIG. 5 is a schematic plan view of a grid layer support structure

FIG. 6 is a schematic view of a radial grid bar support pattern;

FIG. 7 is a schematic view of a 1-unit tangential grid arrangement;

FIG. 8 is a schematic view of a 2-unit tangential grid bar arrangement;

FIG. 9 is a schematic view of a 3-unit tangential grill arrangement;

FIG. 10 is a schematic top view of the dispensing line;

FIG. 11 is a perspective view corresponding to FIG. 10;

FIG. 12 is a schematic top view of the top layer dispensing line;

FIG. 13 is a perspective view corresponding to FIG. 11;

FIG. 14 is a schematic top view of the bottom layer distribution piping;

FIG. 15 is a perspective view corresponding to FIG. 14;

FIG. 16 is a schematic view of a bayonet-type connection;

FIG. 17 is an enlarged view of a portion of FIG. 16 relating to the card slot;

FIG. 18 is a schematic view of a pre-welded plate connection;

fig. 19 is a partially enlarged view of fig. 18 relating to a tack-free welded plate.

Detailed Description

The invention relates to an ecological geometry self-expanding structure simulated moving bed suitable for efficient separation of a liquid-solid system, which comprises a vertical shell, wherein a plurality of grating layers are sequentially distributed in the shell at intervals from top to bottom, the shell is provided with a long column with a regular hexagonal cross section penetrating through the top/bottom of the tower along the axis as a central support body (which can be called a central column), 6 main frames (which can be called radial grating strips) which naturally radiate and extend to the inner wall of an adsorption tower from each side surface of the central column by taking a regular hexagonal grating unit as a unit are arranged in each grating layer to form an ecological geometry expanding hexagonal star-shaped radiation structure as a support framework of a single-layer grating layer, and each main frame is integrally formed outside the tower and integrally hoist. The space between the main frames is formed by filling regular hexagonal grid units with the same size as the main frames, and each row of grid units between the main frames are used as a forming piece (which can be called tangential grid bars) and assembled on a support framework of the grid layer to form the grid layer covering the whole bed layer section. The regular hexagonal grid units which are adjacent to each other are respectively provided with respective unit material inlet and outlet pipes, each grid layer is provided with respective fluid distribution structures, each fluid distribution structure is provided with a respective distribution header pipe, the distribution header pipes are connected with the unit material inlet and outlet pipes in the grid layer through one-stage or multi-stage distribution pipe systems, one or more external interfaces are arranged on the same distribution header pipe, when the number of the external interfaces is multiple, each external interface is respectively connected with a respective external pipe, and each external pipe is respectively provided with a respective valve.

Referring to fig. 1-9, the moving bed of the present invention includes a tower body (or called shell) 10, a plurality of grid layers 40 are vertically and sequentially distributed in the tower body, a space between adjacent grid layers is an adsorption bed layer 30, and is filled with corresponding adsorbents or other materials according to adsorption requirements, the grid layers are horizontally arranged and are composed of a plurality of radial grid bars and a plurality of tangential grid bars which are closely distributed, the grid bars include radial grid bars 42 and tangential grid bars 43, 44, 45 (the extending direction of the grid bars is the tangential direction of the circumference where the middle part of the grid bars is located), the number of the radial grid bars is a plurality, and the number of the tangential grid bars is a plurality. The tower body is internally provided with a vertical central column 20 along the axis of the tower body, each radial grid strip is distributed at equal angular distance (the included angle between any two adjacent radial grid strips is equal), the inner end of each radial grid strip is supported on a corresponding supporting structure 22 of the side surface (outer side surface) of the central column, the outer end of each radial grid strip is supported on a corresponding supporting structure 12 of the inner wall of the tower body, the tangential grid strips are positioned between two adjacent radial grid strips and have the same included angle with the two corresponding radial grid strips, the two ends of each tangential grid strip are respectively connected to corresponding side edges (frames) of the radial grid strips positioned at the corresponding ends, each grid strip is composed of one or more grid units, when the grid strips are provided with a plurality of grid units, each grid unit is linearly arranged, the connection mode is that any adjacent grid units on the same grid strip share one frame, namely, the wall is shared by any adjacent grid units on.

The grid unit is in a regular hexagonal cylinder shape (a cylinder shape with a regular hexagonal prism).

The grid bars are preferably integrally formed parts, and can be made of thermoplastic materials through injection molding, and other suitable materials and suitable preparation processes can be adopted.

The main body part of the central column is a regular hexagonal prism with a regular hexahedral cross section, and the outer diameter (outer contour dimension) of the central column is generally equal to that of the grid units.

The number of the radial grid bars is six, the inner ends of the radial grid bars are opposite to the side surface of the corresponding side of the central column, and the radial direction (the radial direction of the tower body) perpendicular to the side surface is adopted.

According to the installation requirement, the outer ends of the radial grid bars can be set as half grid units (or called as 0.5 grid units), the called 0.5 grid units are equivalent to the parts of one grid unit cut along two opposite edges, end panels (vertical panels connecting the two cut edges) can be arranged at the cut ends, the 0.5 grid units are used for being lapped on a supporting structure of the tower body, meanwhile, the side frames of the side surfaces (the connecting sides with the tangential grid bars) are connected with the side frames of the adjacent grid units in a folded plate shape, and the side frames of the two complete grid units are connected into the same shape so as to be jointed with the ends of the corresponding tangential grid bars.

Between any two adjacent radial grid bars, N tangential grid bars are arranged in sequence from inside to outside, wherein the nth tangential grid bar contains N grid units, which may be referred to as N unit grid bars, wherein N is 1,2, 3.

For example, between any two adjacent radial grid bars, from inside to outside, the first tangential grid bar 43 contains only one grid unit, which may be referred to as a 1-unit grid bar, the second grid bar 44 contains two grid units, which may be referred to as a 2-unit grid bar, and the third grid bar 45 contains 3 grid units, which may be referred to as a 3-unit grid bar.

One preferred embodiment is N ═ 3. That is, the number of the grid units (complete grid units) contained in the radial grid bars is 3, and the number of the grid bars in the same radial direction from inside to outside is 3, so that the structure can meet the requirement of uniform distribution of materials, simultaneously avoid the equipment structure (including a water inlet pipeline system) from being too complex, and can obtain a process material distribution system with completely same resistance to all the grid units.

For 1 unit grid bar, because it is the grid unit, is the rotational symmetry structure, can select its arbitrary suitable direction as its extending direction, when both ends in the tangential are equipped with connection structure (for example, draw-in groove or reserve welded plate), can confirm its extending direction according to the connection structure who sets up.

Usually, the corresponding edges of the grid bars on the grid layer are arranged together, but the gap required for assembly, for example, 10mm, can be left between the adjacent grid bars due to the convenience of assembly and the limitation of machining precision.

According to the arrangement mode, the grid layer similar to a honeycomb is formed, and the honeycomb structure covers the whole flow area (the cross section of the tower body) except that the outermost tangential grid bars are not strictly attached to the inner wall of the tower body.

The tower body can adopt the prior art, and the top and the bottom of the tower body can be provided with an upper seal head 18 and a lower seal head 17 with curved surfaces.

Referring to fig. 16-17, the top of the end plate of the tangential grid bars is provided with an outwardly extending downwardly opening slot structure 46, which is configured (including sized) to ensure that, when assembled, the outer wall 48 of the slot structure is snugly received inside the corresponding side wall of the radial grid bar to which it is attached, such that the corresponding side wall of the corresponding radial grid bar is supported below the slot structure, thereby providing support and securement of the tangential grid bar to the corresponding radial grid bar. Because the grid unit adopts a regular hexagonal cylinder shape, the end plate of the grid unit is in a folded plate shape, the corresponding clamping groove structure is also in a folded plate shape and is in a groove structure with corresponding bending and equal width, and the corresponding connecting parts of the corresponding side walls of the radial grid strips are also in a similar folded plate shape, so that the grid unit can not slide in any plane direction in the clamping connection.

Usually, the number of bed layers can be 8-17, and the bed layer is formed by densely filling the adsorbent; correspondingly, the number of grid layers is 9-18.

Typically, the bed may have a diameter of 6 to 14 m.

Typically, the height of the grid elements may be 100-350 mm. Referring to fig. 18-19, the bottom of the end plate of the tangential grid bars is provided with a planar welding plate 49 extending outward, the configuration (including the dimensions) of the planar welding plate should ensure that the planar welding plate can extend right under the corresponding frame of the radial grid bars connected with the planar welding plate after assembly, and should be located at a position suitable for mutual welding, and the planar welding plate and the corresponding radial grid bars are welded together by continuous welding (such as fillet welding) or non-continuous welding to realize the fixed connection of the two.

According to actual needs, the end part of the tangential grid bar can be simultaneously provided with a clamping groove structure at the top and a plane welding plate at the bottom, and also can be only provided with a clamping groove structure at the top or a plane welding plate at the bottom.

The central column may be generally hollow, i.e. cylindrical (or tubular), in which case it may also be referred to as a central cylinder.

The supporting structure of the side surface of the central column and the supporting structure of the inner wall of the tower body can adopt supporting rings, wherein the supporting structure of the side surface of the central column is an outer supporting ring which is tightly sleeved on the outer side of the central column and is fixedly connected (for example welded) with the central column, and the supporting structure of the inner wall of the tower body is an inner supporting ring which is tightly attached to the inner side of the tower body and is fixedly connected (for example welded) with the tower body.

The top surface of each support ring may be generally planar.

The top surface of the support ring can be provided with clamping grooves, and the end plates at the corresponding ends of the radial grid bars connected with the support ring are clamped on the corresponding clamping grooves, so that the plane movement of the radial grid bars is limited.

The top surface of the support ring can also be provided with a clamping column which protrudes upwards. After assembly, the clamping columns are inserted into the grids at the corresponding ends of the radial grid bars connected with the clamping columns and tightly attached to the inner sides of the end plates at the corresponding ends, so that the plane movement of the radial grid bars is limited.

The fixing of the ends of the radial grid bars to the respective support rings may be effected with or without the provision of fixing connectors. For example, a pressure plate matched with the end shape of the radial grid bars is pressed on the corresponding ends of the radial grid bars, fastening bolts are fastened on the corresponding support rings through holes on the pressure plate, and the heads of the bolts are pressed on the corresponding pressure plates, so that the corresponding ends of the radial grid bars and the support rings are fixed together through the pressure plates.

Referring to fig. 10-15, a multi-stage distribution pipeline can be configured to match with the grid layer for feeding distribution and discharging, the corresponding (connection) relationship between the upper distribution pipeline and the lower distribution pipeline is one-to-many, that is, one upper distribution pipeline is connected with a plurality of lower distribution pipelines, and one lower distribution pipeline is connected with only one upper distribution pipeline, so that the resistance of the material flow on the multi-stage distribution pipeline is the same for all grid units (usually, complete grid units, which may not include half grid units at the outer ends of radial grid bars, which are mainly used to connect with corresponding support structures) according to the number of grid units on the same grid layer, this ensures that the flow rates of the feed (or discharge) to each grid cell are the same.

For example, for the grid layer shown in fig. 2, the multi-stage distribution pipeline may include a first-stage distribution pipe 51, a second-stage distribution pipe 54, a third-stage distribution pipe 55 and a last-stage distribution pipe 56, the first-stage distribution pipe is connected to the process material conveying pipeline 60 and is one, the number of the second-stage distribution pipes is 6, the second-stage distribution pipes respectively correspond to 6 fan-shaped regions on the corresponding grid layer (one radial grid bar and each adjacent tangential grid bar on one side in the circumferential direction are one fan-shaped region), one end of the second-stage distribution pipe is connected to the first-stage distribution pipe, the other end of the second-stage distribution pipe is connected to the corresponding third-stage distribution pipe, the number of the third-stage distribution pipes connected to the same second-stage distribution pipe is multiple, the third-stage distribution pipes respectively correspond to 3 small regions in the corresponding fan-shaped regions, one end of the third-, e.g. 3, corresponding to the respective small area of the 3 grid cells, the nozzles of the final distribution pipes being located in the respective grid cells to enable the feeding and discharging of the respective grid cells.

The first-stage distribution pipes of the multi-stage distribution pipelines positioned in the middle layer (each layer of the interlayer except the top layer and the bottom layer) can be horizontal annular pipes and are positioned at the position close to the inner wall of the tower body or the vertical projection of the first-stage distribution pipes is positioned at the edge part of the corresponding grid layer. The one-stage distribution pipes of the multi-stage distribution pipes located at the top and bottom stages can also adopt such a configuration.

The first-stage distribution pipes of the multi-stage distribution pipelines positioned at the top layer and the bottom layer can also be vertical pipes positioned on the axis of the tower body.

Typically, the primary distribution pipes may be located above the respective grid levels. However, when the primary distribution pipe of the multistage distribution pipeline located at the bottom layer is a vertical pipe located on the axis of the tower body, the multistage distribution pipeline is located below the corresponding grid layer so as to avoid collision with the central column.

The second-stage distribution pipe, the third-stage distribution pipe and the last-stage distribution pipe comprise a horizontal section and a vertical section, are inverted L-shaped or L-shaped (if the first-stage distribution pipe is positioned below the corresponding grid layer), the external end (the end not connected with the vertical section) of the horizontal section of the lower-stage distribution pipe is connected with the corresponding upper-stage distribution pipe, and the external end (the end not connected with the horizontal section) of the vertical section is connected with the corresponding lower-stage distribution pipe.

The grid layer shown in fig. 2 is a preferred embodiment, the number of the radial grid bars is 6, each radial grid bar comprises 3 complete grid units, the outer end of the radial grid bar is also provided with a half grid unit for supporting, the radial grid bar is mainly used for supporting, the number of the tangential grid bars between any two adjacent radial grid bars is three, and the three tangential grid bars are respectively 1 unit grid bar, 2 unit grid bars and 3 unit grid bars, so that the whole grid layer is equally divided into 6 fan-shaped areas, and each fan-shaped area comprises 9 complete grid units for feeding distribution and discharging collection. With such a grid layer, the resistance of the material flow path corresponding to each grid unit can be at least theoretically the same with a multi-stage distribution circuit of the above-described 4-stage configuration, and with a moving bed, a division of the distribution devices into 54 small zones per layer is also sufficient to ensure homogeneity requirements.

The distribution effect of the same section with the diameter of 8 meters is compared, and the result is as follows:

the invention is a self-expanding six-membered ring structure, and has the advantages of short material running path, high self-symmetry, uniform distribution and small pressure loss.

The technical means disclosed by the invention can be combined arbitrarily to form a plurality of different technical schemes except for special description and the further limitation that one technical means is another technical means.

Claims (10)

1. The simulated moving bed with the ecological geometry self-expanding structure comprises a tower body and is characterized in that a central column and a plurality of grid layers which are distributed up and down are arranged in the tower body, a space for forming an adsorption bed layer is reserved between every two adjacent grid layers, the adsorption bed layer is multilayer, the central column is in a regular hexagonal prism shape, the grid layers are horizontally arranged and consist of a plurality of grid strips which are closely distributed on the same horizontal plane, each grid strip consists of one or more grid units and comprises radial grid strips and tangential grid strips, each grid unit is in a regular hexagonal cylinder shape and is provided with a six-sided frame, when each grid strip comprises a plurality of grid units, the grid units are linearly arranged, the adjacent grid units are in the same wall, the radial grid strips on the same grid layer are 6 and are distributed at equal angular distance, and the radial grid strips are arranged along the radial direction of the tower body, the inner end of the tower body is opposite to one outer side face of the central column and supported on the central column, the outer end of the tower body is supported on the tower body, the tangential grid bars are arranged along the tangential direction of the tower body and filled in the area between the adjacent radial grid bars, the end parts of the tangential grid bars are connected with the frames of the radial grid bars at the corresponding parts, and the tangential grid bars and the radial grid bars are spliced together to form a complete grid layer.

2. The simulated moving bed with ecological geometry self-expanding structure according to claim 1, wherein the central column and the tower body are both provided with a support structure for supporting the radial grid bars, the support structure of the central column is a horizontal outer support ring fixedly arranged at the outer side of the central column, the support structure of the tower body is a horizontal inner support ring fixedly arranged at the inner side of the tower body, and two ends of the radial grid bars are respectively supported on the upper surfaces of the inner support ring and the outer support ring.

3. The ecological geometric self-expandable structure simulated moving bed according to claim 2, wherein fixed connecting structures or fixed connecting pieces are arranged or not arranged between the inner ends of the radial grid bars and the corresponding inner support rings, and fixed connecting structures or fixed connecting pieces are arranged or not arranged between the outer ends of the radial grid bars and the corresponding outer support rings.

4. The simulated moving bed with ecological geometry self-expanding structure according to claim 1, wherein the radial grid bars and the tangential grid bars are all integrally formed parts, the radial grid bars, the central column and the tower body are connected together to form a support framework of the grid layer, and side frames of the radial grid bars form support parts of the corresponding tangential grid bars.

5. The simulated moving bed with ecological geometry self-expanding structure according to claim 4, wherein on the same grid layer, the grid bars are spliced in a way that the adjacent side frames of the adjacent grid units are opposite.

6. An ecological geometric self-expanding structural simulated moving bed according to claim 5, wherein the outer ends of said radial grid bars are provided with overlapping structures in the form of half grid elements for supporting on the supporting structure of said tower body and enabling connection with the corresponding side frames of the outermost tangential grid bars.

7. The ecological geometry self-expanding structural simulated moving bed according to any of claims 1-6, wherein the connection manner between the tangential grid bars and the corresponding radial grid bars is a slot-type connection, the top of the end frame of the tangential grid bars opposite to the radial grid bars is provided with a slot structure which extends outwards and is opened downwards, the slot structure is buckled on the corresponding frame of the radial grid bars, and the outer wall of the slot structure is clamped inside the corresponding frame of the radial grid bars.

8. An ecological geometric self-expanding structural simulated moving bed according to any of claims 1 to 6, wherein the tangential grid bars and the corresponding radial grid bars are connected by means of a reserved welding plate, the bottom of the end frame of the tangential grid bars opposite to the radial grid bars is provided with a horizontal reserved welding plate which extends outwards, and the reserved welding plate is welded with the bottom of the corresponding frame of the radial grid bars.

9. An ecological geometric self-expanding structured simulated moving bed according to any of claims 1 to 6, wherein said radial grid bars comprise 3 complete grid elements, and three tangential grid bars are provided between any adjacent radial grid bars, respectively, a 1 unit grid bar consisting of 1 grid element, a 2 unit grid bar consisting of 2 grid elements, and a 3 unit grid bar consisting of 3 grid elements from the inside to the outside.

10. An ecological geometry self-expanding structured simulated moving bed according to any of claims 1 to 6, wherein each grid layer is provided with a respective multi-stage distribution piping system, the corresponding relationship between the upper stage distribution pipes and the lower stage distribution pipes of the multi-stage distribution piping system is one-to-many, and the number of grid units corresponding to each distribution pipe of the same stage is the same.

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