CN220801994U - Falling film crystallizer and purification system - Google Patents

Abstract

The utility model relates to a falling film crystallizer and a purification system. The falling film crystallizer comprises a shell, wherein a material inlet and a material outlet are respectively arranged at the top and the bottom of the shell, a plurality of crystallization tubes are vertically arranged in the shell, an induced crystallization area and a crystallization area are sequentially arranged between the material inlet and the material outlet, a heat conducting medium inlet, a distribution plate, a heat conducting medium outlet and a bottom plate are sequentially arranged in the induced crystallization area and the crystallization area from top to bottom, the distribution plate is arranged along the horizontal direction, a plurality of deflectors corresponding to the crystallization tubes one to one are fixedly arranged on the distribution plate, the deflectors are sleeved outside the crystallization tubes, a top plate corresponding to the crystallization tubes one to one is further arranged between the induced crystallization area and the material inlet, a plurality of through holes corresponding to the crystallization tubes are formed in the top plate and the bottom plate, and the top plate and the bottom plate are sleeved outside the crystallization tubes through the through holes. According to the utility model, the crystallization induction zone between the material inlet and the crystallization zone is additionally arranged, so that the material liquid can be pre-cooled, and the crystallization core in the material liquid is easy to form.

Description

Falling film crystallizer and purification system

Technical Field

The utility model belongs to the technical field of chemical equipment, and particularly relates to a falling film crystallizer and a purification system.

Background

The falling film crystallizer is a device for a falling film crystallization process, and the falling film crystallizer enables solute in the feed liquid to be crystallized into crystals through a cooling process (generally, heat exchange is carried out between the feed liquid and a heat conducting medium flowing in a film shape on the other side of a wall surface in the process of downwards flowing on the solid wall surface, so that the temperature of the feed liquid is reduced). The falling film crystallizer is widely applied to the processes of refining homologues and isomers of organic matters with similar boiling points, separating and purifying thermosensitive substances, preparing high-purity and ultra-high-purity products and the like.

In the related art, a conventional falling film crystallizer generally adopts a single cooler or a single cooler to reduce the temperature of a solution, so as to promote crystallization of solute substances in a feed liquid. For example, patent document with publication number CN218339020U discloses a falling film crystallizer, which comprises a housin, top and bottom of casing are provided with feed inlet and discharge gate respectively, inside from the top down of casing has set gradually push rod subassembly and the crystallization board that sets up along vertical direction, the crystallization board is provided with crystallization tank and heat exchange cavity along vertical direction, the crystallization tank communicates the feed inlet through the inlet pipe, the heat exchange cavity is located crystallization tank adjacent area, push rod subassembly is provided with first actuating mechanism and the push rod that corresponds with the crystallization tank, actuating mechanism is used for driving the push rod, so that the push rod pushes away crystal substance from crystallization tank wall face, the push rod sets up along vertical direction, upper portion or lower part of casing is equipped with the cold and hot medium import that is linked together with the heat exchange cavity, the cold and hot medium export that is linked together with the heat exchange cavity has been seted up to lower part or upper portion of casing. It is well known that the formation of nuclei is critical during crystallization. However, when the falling film crystallizer is used for treatment, the formation of crystal nuclei is influenced by various factors such as impurities in solution, supersaturation degree, flowing state and the like, and the factors possibly lead to the formation of the crystal nuclei, so that the starting of crystallization is delayed or the crystallization efficiency is low, larger supercooling degree is required, and the whole crystallization process is long in time and high in energy consumption. Second, an excessive supercooling degree causes rapid crystallization after seed generation, resulting in poor crystallization purification effect and even clogging of equipment. Furthermore, the crystallization speed may be different in different stages by adopting the conventional falling film crystallizer for treatment, and the reason is that the crystallization initial crystal nucleus formation stage requires a larger supercooling degree and driving force than the crystal nucleus growth stage in the later crystallization stage, so that the crystallization speed is uneven in different stages in the crystallization process, the crystal size and morphology are further uneven, and the quality and purity of the product are reduced. In addition, the traditional falling film crystallizer generally adopts a distributor to distribute cold and hot media to the outer wall of the crystallizer so that the cold and hot media flow downwards in a membranous flowing state along the outer wall of the crystallization pipe, however, because the crystallization pipe is generally a round pipe, cold and hot media fluid is easy to gather in the process of downwards and longitudinally flowing under the action of gravity, the phenomenon of uneven film formation is easy to be caused, thereby influencing the heat exchange effect of the cold and hot media, increasing the time consumption of the crystallization process and increasing the demand of the cold and hot media.

In summary, the existing falling film crystallizer is adopted for treatment, and the problems of difficult formation of crystal nucleus, uneven crystallization speed and uneven distribution of cooling and heating media on the outer wall of the crystallization tube exist, so that the crystallization process takes longer time, the energy consumption is increased, and the quality and purity of the product are reduced. And the like.

Disclosure of utility model

In view of the above, the present utility model aims to provide a falling film crystallizer and a purification system, so as to solve the technical problems of difficult formation of crystal nuclei, uneven crystallization speed, uneven distribution of cooling and heating media on the outer wall of a crystallization tube, long time consumption in the crystallization process, increased energy consumption, reduced product quality and purity, etc. caused by adopting the existing falling film crystallizer for treatment.

In a first aspect, the utility model provides a falling film crystallizer, which comprises a shell, wherein a material inlet and a material outlet are respectively arranged at the top and the bottom of the shell, a plurality of crystallization pipes vertically arranged are arranged in the shell, an induced crystallization area and a crystallization area are sequentially arranged between the material inlet and the material outlet, a heat conducting medium inlet, a distribution plate, a heat conducting medium outlet and a bottom plate are sequentially arranged in the induced crystallization area and the crystallization area from top to bottom, the distribution plate is arranged along the horizontal direction, a plurality of flow directors which are in one-to-one correspondence with the crystallization pipes are fixedly arranged on the distribution plate, the flow directors are sleeved outside the crystallization pipes, a top plate which is arranged along the horizontal direction is also arranged between the induced crystallization area and the material inlet, a plurality of through holes which are in one-to-one correspondence with the crystallization pipes are formed in the top plate and the bottom plate, and the top plate are sleeved outside the crystallization pipes through the through holes.

The falling film crystallizer of the utility model has the principle that: by additionally arranging an induced crystallization area between the material inlet and the crystallization area and arranging a heat-conducting medium inlet and a heat-conducting medium outlet in the induced crystallization area, the heat-conducting medium can be introduced into the falling film crystallizer through the heat-conducting medium inlet to pre-cool the material liquid, and crystal cores in the material liquid are easy to form; secondly, the crystallization part can improve the uniformity of crystallization speed through the pre-cooling treatment of the induced crystallization area, avoid the speed difference in the crystal growth process, improve the uniformity of crystal size and morphology, and improve the quality and purity of the product; furthermore, the crystallization efficiency is improved, the crystallization process is accelerated, and the crystallization process time is shortened; in addition, the supercooling degree of material crystallization is reduced by the action of the pre-cooling zone, and the energy consumption in the crystallization process can be reduced.

The crystallization process by adopting the falling film crystallizer of the utility model is as follows:

Feeding a material to be treated into the falling film crystallizer through a material inlet, then feeding the material into a crystallization pipe and distributing the material on the inner wall of the crystallization pipe in a film shape, and enabling the material to flow in a film shape on the inner wall of the crystallization pipe;

The heat conducting medium is fed into the induced crystallization area through a heat conducting medium inlet, and is uniformly distributed on the outer wall of the crystallization pipe through a flow director, in the process, the heat conducting medium gradually absorbs the heat of the crystallization pipe, the temperature of a material to be treated on the inner wall of the crystallization pipe is reduced, under the supercooling condition, the material is crystallized on the crystallization pipe at the precooling area part to form crystal nuclei, and meanwhile, the heat conducting medium flows through the outer wall of the crystallization pipe in a film forming way and is collected on the bottom plate of the precooling area, and the heat conducting medium after heat exchange can be discharged through a heat conducting medium outlet;

then, feeding a heat-conducting medium into the crystallization area through a heat-conducting medium inlet, distributing the heat-conducting medium on the outer wall of the crystallization pipe through a flow director on a distributing plate, so that the heat-conducting medium forms a layer of uniform film on the outer wall of the crystallization pipe, exchanging heat between the heat-conducting medium and materials in the crystallization pipe of the crystallization area, and crystallizing part of the materials on the inner wall of the crystallization pipe; according to the utility model, the crystallization induction area is additionally arranged, so that the material in the crystallization tube can form crystals in the crystallization induction area, the material can be used as crystal nuclei for crystallization in the crystallization area, the time for forming the crystal nuclei in the crystallization area is reduced, and meanwhile, the crystallization area does not need larger supercooling degree for crystallization, so that on one hand, the energy consumption required by crystallization is saved, and on the other hand, the crystallization process speed is relatively uniform, thereby improving the uniformity of crystal size and morphology, and improving the quality and purity of products.

In some embodiments of the present application, the crystallization area is provided with a plurality of distribution plates arranged along the horizontal direction from top to bottom.

According to the utility model, the plurality of distribution plates arranged along the horizontal direction are arranged from top to bottom in the crystallization area, so that the heat conducting medium can be distributed again, and the phenomenon of uneven crystallization caused by aggregation and flow of the heat conducting medium outside the crystallization pipe due to overlong crystallization pipe is prevented.

In some embodiments of the application, the material inlet is internally provided with a distributor.

In some embodiments of the present application, the deflector is annular, the deflector is provided with a deflector inlet, a deflector outlet and a deflector channel located between the deflector inlet and the deflector outlet, the deflector channel is tangentially connected with the deflector inlet, the deflector inlet is located above the deflector outlet, and the deflector outlet is fixedly arranged on the distribution plate.

According to the utility model, the tangential velocity of the heat conducting medium in the fluid director can be increased by tangentially connecting the flow guiding channel with the flow guiding inlet, so that the tangential rotational flow degree of the heat conducting medium is increased, the longitudinal aggregation force of fluid is reduced, and the uniformity of the heat conducting medium on the outer wall of the crystallization tube is further increased.

In some embodiments of the application, the deflector is provided with a plurality of deflector inlets, deflector outlets and deflector channels between the deflector inlets and the deflector outlets along the circumferential direction, the deflector channels being tangentially connected to the respective deflector inlets.

According to the utility model, the flow guider is provided with the plurality of flow guiding inlets, the flow guiding outlets and the flow guiding channels between the flow guiding inlets and the flow guiding outlets along the circumferential direction, so that the cooling medium can be further split, the split cooling medium can exchange heat with the material to be treated better, and the crystallization uniformity is further improved.

In some embodiments of the application, the diversion channel is tangentially connected to the diversion outlet.

According to the utility model, the diversion channel and the diversion outlet are tangentially connected, so that the tangential rotational flow degree of the heat-conducting medium when flowing out from the diversion channel is increased, the longitudinal aggregation force of the heat-conducting medium is reduced, the heat-conducting medium forms a rotational flow flowing state on the outer wall of the crystallization tube, the uniformity of the heat-conducting medium film distribution is enhanced, and a layer of uniform film is formed on the outer wall of the crystallization tube by the heat-conducting medium.

In some embodiments of the application, the width of the diversion inlet is 2-8mm.

In some embodiments of the application, the height of the diversion inlet is 2-8mm.

In some embodiments of the application, the flow-directing channel is S-shaped.

According to the utility model, the guide channel is arranged in an S shape, so that the heat conducting medium can flow downwards in a cyclone mode through the guide of the guide surface of the guide channel, the uniformity of the heat conducting medium film is further increased, and the crystallization effect is further improved.

In some embodiments of the present application, a plurality of film distributors are further disposed in the housing, and the film distributors are located between the distributor and the crystallization tubes, and are in one-to-one correspondence and are communicated with the crystallization tubes.

In some embodiments of the application, the application also provides a purification system comprising a falling film crystallizer as described above.

In some embodiments of the present application, the bottom of the crystallization tube is provided with a feed opening, the feed opening is communicated with the material outlet, the purification system further comprises a material storage container, the material storage container is provided with a feed opening and a discharge opening, the feed opening is communicated with the material outlet, the discharge opening is communicated with the material inlet through a circulation pipeline, and a centrifugal pump is arranged on the circulation pipeline.

According to the utility model, the material storage container is additionally arranged, the material storage container is provided with the feed inlet and the discharge outlet, the feed inlet is communicated with the discharge outlet, the discharge outlet is communicated with the material inlet through the circulating pipeline, the centrifugal pump is arranged on the circulating pipeline, and the uncrystallized material can be sent into the falling film crystallizer for further treatment through the centrifugal pump, so that the utilization rate of the raw material is improved, and the yield is improved.

Drawings

FIG. 1 is a schematic diagram of the falling film crystallizer of example 1;

FIG. 2 is an assembly view of the distributor plate, the flow director and the crystallization tube in example 1;

FIG. 3 is an expanded view of the deflector of example 1;

FIG. 4 is an expanded view of the deflector of example 2;

FIG. 5 is a schematic diagram of the falling film crystallizer of example 2;

FIG. 6 is a schematic diagram of the purification system of example 3.

Description of the reference numerals

11-Material inlets, 111-distributors, 12-material outlets, 13-crystallization tubes, 131-film distributor, 14-top plate, 15-heat conducting medium inlets, 16-distribution plate, 161-flow guider, 1611-flow guiding inlets, 1612-flow guiding outlets, 1613-flow guiding channels, 17-heat conducting medium outlets and 18-bottom plate;

2-a material storage container;

3-centrifugal pump.

Detailed Description

The present utility model will be further described with reference to the following specific examples, but it should be noted that the specific material ratios, process conditions, results, etc. described in the embodiments of the present utility model are only for illustrating the present utility model, and are not intended to limit the scope of the present utility model, and all equivalent changes or modifications according to the spirit of the present utility model should be included in the scope of the present utility model.

It should be noted that all directional indicators (such as up, down, in, out) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

In the present utility model, unless explicitly specified and defined otherwise, the term "connected" and the like should be construed broadly, and may be, for example, directly connected or indirectly connected through intermediaries, or may be connected internally of two elements or an interaction relationship of the two elements unless explicitly specified otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides a falling film crystallizer which comprises a shell, wherein a material inlet and a material outlet are respectively arranged at the top and the bottom of the shell, a plurality of vertically arranged crystallization pipes are arranged in the shell, an induced crystallization area and a crystallization area are sequentially arranged between the material inlet and the material outlet, a distributor is arranged in the material inlet, a plurality of film distributors are also arranged in the shell, the film distributors are positioned between the distributor and the crystallization pipes, and the film distributors are in one-to-one correspondence and are communicated with the crystallization pipes.

The crystallization induction zone and the crystallization zone are sequentially provided with a heat conducting medium inlet, a distribution plate, a heat conducting medium outlet and a bottom plate from top to bottom, the distribution plate is arranged along the horizontal direction, a plurality of flow directors which are in one-to-one correspondence with the crystallization tubes are fixedly arranged on the distribution plate, the flow directors are sleeved outside the crystallization tubes, a top plate which is arranged along the horizontal direction is also arranged between the crystallization induction zone and the material inlet, through holes which are in one-to-one correspondence with the crystallization tubes are formed in the top plate and the bottom plate, and the top plate and the bottom plate are sleeved outside the crystallization tubes through the through holes;

The fluid director is annular, and the fluid director is provided with water conservancy diversion import, water conservancy diversion export and is located water conservancy diversion passageway between water conservancy diversion import and the water conservancy diversion export, and water conservancy diversion passageway and water conservancy diversion import and water conservancy diversion export are all tangential connection, and the water conservancy diversion import is located water conservancy diversion export top, and the water conservancy diversion export is fixed to be set up on the distribution plate, and the width of water conservancy diversion import is 2-8mm, and the height of water conservancy diversion import is 2-8mm, and the water conservancy diversion passageway is the S type.

In some embodiments of the present application, the crystallization area is provided with a plurality of distribution plates arranged along the horizontal direction from top to bottom.

In some embodiments of the application, the application further provides a purification system, which comprises the falling film crystallizer, wherein the bottom of the crystallization pipe is provided with a feed opening, the feed opening is communicated with a material outlet, the purification system further comprises a material storage container, the material storage container is provided with a feed opening and a discharge opening, the feed opening is communicated with the material outlet, the discharge opening is communicated with a material inlet through a circulating pipeline, and the circulating pipeline is provided with a centrifugal pump.

In the related art, a single cooler or cooler is generally adopted in a falling film crystallizer to reduce the temperature of a solution, so that solute substances in feed liquid are crystallized, and the existing falling film crystallizer is adopted for treatment, so that the technical problems that crystal nuclei are difficult to form, the crystallization speed is uneven, the distribution of cooling and heating media on the outer wall of a crystallization tube is uneven, the time consumption of the crystallization process is long, the energy consumption is increased, the product quality and purity are reduced and the like are caused. The application provides a falling film crystallizer aiming at the problems.

The present utility model will be described in detail with reference to specific exemplary examples. It is also to be understood that the following examples are given solely for the purpose of illustration and are not to be construed as limitations upon the scope of the utility model, as many insubstantial modifications and variations are within the scope of the utility model as would be apparent to those skilled in the art in light of the foregoing disclosure.

Example 1

Referring to fig. 1, fig. 1 is a schematic structural diagram of a falling film crystallizer according to the present embodiment.

As shown in fig. 1, the falling film crystallizer comprises a shell, wherein a material inlet 11 and a material outlet 12 are respectively arranged at the top and the bottom of the shell, a plurality of vertically arranged crystallization pipes 13 are arranged in the shell, a material loading opening and a material unloading opening are respectively arranged at the top and the bottom of the crystallization pipes 13, an induced crystallization area and a crystallization area are sequentially arranged between the material inlet 11 and the material outlet 12, a distributor 111 is arranged in the material inlet 11, the distributor 111 is in the prior art, and no water boiling is performed. The material inlet 11 is communicated with a distribution pipe network, and the distribution pipe network is provided with a plurality of liquid distributing heads which are in one-to-one correspondence with the crystallization pipes 13.

With continued reference to fig. 1, a film distributor 131 is disposed in the housing, and the film distributor 131 is located between the liquid separating head and the crystallization tube 13, and the film distributor 131 is in one-to-one correspondence and communicated with the crystallization tube. The film distributor 131 is a prior art, and will not be described herein.

With continued reference to fig. 1, a top plate 14 is further disposed between the crystallization induction zone and the material inlet 11 and along a horizontal direction, the top plate 14 is used for fixing the crystallization tubes 13, the top plate 14 is provided with a plurality of through holes, all the through holes are respectively in one-to-one correspondence with the crystallization tubes 13, the diameter of each through hole is slightly larger than the outer diameter of each crystallization tube 13, and the top plate 14 is sleeved outside the crystallization tubes 13 through the through holes, so that the crystallization tubes 13 are fixed on the inner wall of the shell through the top plate 14.

With continued reference to fig. 1, the crystallization induction zone is used for primarily cooling the material to be treated, so that the solute in the material to be treated crystallizes on the wall of the crystallization tube 13 of the crystallization induction zone and forms crystal nuclei. The induced crystallization area is sequentially provided with a heat conducting medium inlet 15, a distribution plate 16, a heat conducting medium outlet 17 and a bottom plate 18 from top to bottom.

With continued reference to fig. 1, the heat-conducting medium inlet 15 of the crystallization-inducing zone is used as an inlet for introducing heat-conducting medium into the crystallization-inducing zone of the falling film crystallizer, and the heat-conducting medium outlet 17 of the crystallization-inducing zone is used as an outlet for discharging heat-conducting medium after heat exchange in the crystallization-inducing zone out of the falling film crystallizer.

With continued reference to fig. 1 and 2, the distribution plate 16 of the crystallization-inducing zone is disposed along a horizontal direction, and a plurality of flow directors 161 are fixedly disposed on the distribution plate 16, and all the flow directors 161 are in one-to-one correspondence with the crystallization tubes 13, specifically, all the flow directors 161 are sleeved outside the corresponding crystallization tubes 13.

With continued reference to fig. 2 and 3, the inducer 161 of the crystallization-inducing zone is annular, a plurality of inducer inlets 1611, inducer outlets 1612 and inducer channels 1613 between the inducer inlets 1611 and the inducer outlets 1612 are disposed along the circumferential inducer 161, the inducer channels 1613 are tangentially connected with the inducer inlets 1611 and the inducer outlets 1612, the inducer inlets 1611 are disposed above the inducer outlets 1612, the inducer outlets 1612 are fixedly disposed on the distribution plate 16 through holes formed in the distribution plate 16, the inducer inlets 1611 have a width of 2-8mm, the inducer inlets 1611 have a height of 2-8mm, and the inducer channels 1613 are S-shaped.

Specifically, by tangentially connecting the flow guide channel 1613 with the flow guide inlet 1611, the tangential velocity of the heat-conducting medium in the flow guide channel 1613 can be increased, so as to increase the tangential rotational flow degree of the heat-conducting medium, reduce the longitudinal aggregation force of the fluid, and further increase the uniformity of the heat-conducting medium on the outer wall of the crystallization tube 13. By tangentially connecting the flow guide channel 1613 with the flow guide outlet 1612, the tangential rotational flow degree of the heat conducting medium flowing out of the flow guide channel 1613 can be increased, the longitudinal aggregation force of the heat conducting medium is reduced, the heat conducting medium forms a rotational flow flowing state on the outer wall of the crystallization tube 13, the uniformity of the heat conducting medium film distribution is enhanced, and a layer of uniform film is formed on the outer wall 13 of the crystallization tube by the heat conducting medium. Through setting the water conservancy diversion passageway 1613 to be the S type, can make the heat conduction medium flow downwards through the guide of water conservancy diversion passageway 1613 guide surface into the whirl mode, further increase the homogeneity of heat conduction medium cloth membrane, and then further improve crystallization effect. By arranging the plurality of diversion inlets 1611, the diversion outlets 1612 and the diversion channel 1613 between the diversion inlets and the diversion outlets along the circumferential direction of the diverter 161, the cooling medium can be further diverted, so that the diverted cooling medium can exchange heat with the material to be treated better, and the crystallization uniformity is improved.

With continued reference to fig. 1, the bottom plate 18 of the crystallization induction zone is used for collecting the heat-conducting medium after heat exchange, the bottom plate 18 is located at the lower part of the heat-conducting medium outlet 17, the bottom plate 18 is provided with a plurality of through holes, all the through holes are respectively in one-to-one correspondence with the crystallization tubes 13, the diameter of each through hole is slightly larger than the outer diameter of each crystallization tube 13, and the bottom plate 18 is sleeved outside the crystallization tubes 13 through the through holes, so that the crystallization tubes 13 are fixed on the inner wall of the shell through the bottom plate 18.

The principle of this embodiment is: by additionally arranging an induced crystallization zone between the material inlet 11 and the crystallization zone and arranging a heat-conducting medium inlet 15 and a heat-conducting medium outlet 17 in the induced crystallization zone, the heat-conducting medium can be introduced into the falling film crystallizer through the heat-conducting medium inlet 15 to pre-cool the feed liquid, so that the crystallization cores in the feed liquid are easy to form; secondly, the crystallization part can improve the uniformity of crystallization speed through the pre-cooling treatment of the induced crystallization area, avoid the speed difference in the crystal growth process, improve the uniformity of crystal size and morphology, and improve the quality and purity of the product; furthermore, the crystallization efficiency is improved, the crystallization process is accelerated, and the crystallization process time is shortened; in addition, the supercooling degree of material crystallization is reduced by the action of the pre-cooling zone, and the energy consumption in the crystallization process can be reduced.

With continued reference to fig. 1, the crystallization zone is configured to further cool the material, so as to continuously grow with the crystal nuclei initially formed in the crystallization zone as the center. The crystallization area is provided with a heat conducting medium inlet 15, a distribution plate 16, a heat conducting medium outlet 17 and a bottom plate 18 from top to bottom.

With continued reference to fig. 1, the heat-conducting medium inlet 15 of the crystallization zone is used as an inlet for introducing the heat-conducting medium into the crystallization zone of the falling film crystallizer, and the heat-conducting medium outlet 17 of the crystallization zone is used as an outlet for discharging the heat-conducting medium after heat exchange in the crystallization zone out of the falling film crystallizer.

With continued reference to fig. 1 and 2, the distribution plate 16 of the crystallization area is disposed along a horizontal direction, and a plurality of flow directors 161 are fixedly disposed on the distribution plate 16, and all the flow directors 161 are in one-to-one correspondence with the crystallization tubes 13, specifically, all the flow directors 161 are sleeved outside the corresponding crystallization tubes 13.

With continued reference to fig. 2 and 3, the fluid director 161 in the crystallization zone is annular, the fluid director 161 is provided with a fluid director inlet 1611, a fluid director outlet 1612 and a fluid director channel 1613 between the fluid director inlet 1611 and the fluid director outlet 1612, the fluid director channel 1613 is tangentially connected with the fluid director inlet 1611 and the fluid director outlet 1612, the fluid director inlet 1611 is located above the fluid director outlet 1612, the fluid director outlet 1612 is fixedly arranged on the distribution plate 16 through holes formed in the distribution plate 16, the width of the fluid director inlet 1611 is 2-8mm, the height of the fluid director inlet 1611 is 2-8mm, and the fluid director channel 1613 is S-shaped.

Specifically, by tangentially connecting the flow guide channel 1613 with the flow guide inlet 1611, the tangential velocity of the heat-conducting medium in the flow guide channel 1613 can be increased, so as to increase the tangential rotational flow degree of the heat-conducting medium, reduce the longitudinal aggregation force of the fluid, and further increase the uniformity of the heat-conducting medium on the outer wall of the crystallization tube 13. By tangentially connecting the flow guide channel 1613 with the flow guide outlet 1612, the tangential rotational flow degree of the heat conducting medium flowing out of the flow guide channel 1613 can be increased, the longitudinal aggregation force of the heat conducting medium is reduced, the heat conducting medium forms a rotational flow flowing state on the outer wall of the crystallization tube 13, the uniformity of the heat conducting medium film distribution is enhanced, and a layer of uniform film is formed on the outer wall 13 of the crystallization tube by the heat conducting medium. Through setting the water conservancy diversion passageway 1613 to be the S type, can make the heat conduction medium flow downwards through the guide of water conservancy diversion passageway 1613 guide surface into the whirl mode, further increase the homogeneity of heat conduction medium cloth membrane, and then further improve crystallization effect.

With continued reference to fig. 1, the bottom plate 18 of the crystallization zone is used for collecting the heat-conducting medium in the crystallization zone after heat exchange, the bottom plate 18 is located at the lower part of the heat-conducting medium outlet 17, the bottom plate 18 is provided with a plurality of through holes, all the through holes are respectively in one-to-one correspondence with the crystallization tubes 13, the diameter of each through hole is slightly larger than the outer diameter of each crystallization tube 13, and the bottom plate 18 is sleeved outside the crystallization tubes 13 through the through holes so that the crystallization tubes 13 are fixed on the inner wall of the shell through the bottom plate 18.

The principle of this embodiment is: by additionally arranging the induced crystallization area, the material in the crystallization tube 13 can form crystals in the induced crystallization area and can be used as crystal nucleus for crystallization in the crystallization area, so that the time for forming the crystal nucleus in the crystallization area is reduced, and meanwhile, the crystallization area does not need larger supercooling degree for crystallization, so that on one hand, the energy consumption required by crystallization is saved, and on the other hand, the crystallization process speed is relatively uniform, thereby improving the uniformity of crystal size and morphology and improving the quality and purity of products.

The crystallization process using the falling film crystallizer of this example is as follows:

feeding a material to be treated into a falling film crystallizer through a material inlet, enabling the material to be treated to enter a crystallization pipe 13 under the action of a distributor and to be distributed in a film shape on the inner wall of the crystallization pipe 13, and enabling the material to flow in a film shape on the inner wall of the crystallization pipe 13;

The heat-conducting medium is fed into the crystallization-inducing zone through the heat-conducting medium inlet 15, and when the heat-conducting medium in the crystallization-inducing zone accumulates to a certain amount, the heat-conducting medium enters the guide channel 1613 from the guide inlet 1611. The tangential connection of the flow guide channel 1613 and the flow guide inlet 1611 increases the tangential speed of the heat conducting medium in the flow guide channel 1613, so that the tangential rotational flow degree of the heat conducting medium is increased, the longitudinal aggregation force of fluid is reduced, and the uniformity of film distribution of the heat conducting medium on the outer wall of the crystallization tube 13 is further increased; because the flow guide channel 1613 is S-shaped, the heat conducting medium can flow downwards in a swirling manner through the guide of the guide surface of the flow guide channel 1613, so that the uniformity of the heat conducting medium film is further increased, and the crystallization effect is further improved. Because the flow guide channel 1613 is tangentially connected with the flow guide outlet 1612, the tangential rotational flow degree of the heat conducting medium when flowing out from the flow guide channel 1613 is increased, the longitudinal aggregation force of the heat conducting medium is reduced, the heat conducting medium forms a rotational flow flowing state on the outer wall of the crystallization tube 13, the uniformity of the heat conducting medium film distribution is enhanced, and a layer of uniform film is formed on the outer wall 13 of the crystallization tube by the heat conducting medium. In the process, the heat-conducting medium gradually absorbs the heat of the crystallization tube, the temperature of the material to be treated on the inner wall of the crystallization tube 13 is reduced, under the supercooling condition, the material is crystallized on the crystallization tube 13 of the precooling area part and forms crystal nuclei, and meanwhile, the heat-conducting medium flows through the outer wall of the crystallization tube 13 in a film forming way and is collected on the bottom plate 18 of the crystallization induction area, and the heat-conducting medium after heat exchange can be discharged through the heat-conducting medium outlet 17 of the crystallization induction area;

Then, a heat-conducting medium is fed into the crystallization area through a heat-conducting medium inlet 15, the heat-conducting medium is distributed on the outer wall of the crystallization pipe 13 through a flow director 161 on a distribution plate 16, so that the heat-conducting medium forms a layer of uniform film on the outer wall of the crystallization pipe 13, the heat-conducting medium exchanges heat with materials in the crystallization pipe 13 in the crystallization area, and part of the materials are crystallized on the inner wall of the crystallization pipe 13;

the uncrystallized material can be discharged from the material outlet 12 through a blanking port;

The falling film crystallizer of the embodiment leads the material in the crystallization tube 13 to form crystals in the induced crystallization area by additionally arranging the induced crystallization area, can be used as crystal nucleus for crystallization in the crystallization area, reduces the time for forming the crystal nucleus in the crystallization area, and simultaneously, the crystallization area does not need larger supercooling degree for crystallization, thereby saving the energy consumption for crystallization on one hand and ensuring relatively uniform crystallization process speed on the other hand, thereby improving the uniformity of crystal size and morphology and the quality and purity of products.

Example 2

As shown in fig. 2, this embodiment is different from embodiment 1 in that: a plurality of flow guiding inlets 1611, flow guiding outlets 1612 and flow guiding channels 1613 positioned between the flow guiding inlets 1611 and the flow guiding outlets 1612 are arranged along the circumferential flow director 16, and the flow guiding channels 1613 are tangentially connected with the corresponding flow guiding inlets 1611 and the corresponding flow guiding outlets 1612.

Specifically, in this embodiment, the plurality of flow guiding inlets 1611, the flow guiding outlets 1612 and the flow guiding channels 1613 between the flow guiding inlets 1611 and the flow guiding outlets 1612 are arranged along the circumferential flow director 16, and the flow guiding channels 1613 are tangentially connected with the corresponding flow guiding inlets 1611 and the corresponding flow guiding outlets 1612, so that the cooling medium can be further split, and the split cooling medium can exchange heat with the material to be treated better, thereby improving the crystallization uniformity.

Example 3

Referring to fig. 4, fig. 4 is a schematic structural diagram of a falling film crystallizer according to the present embodiment.

As shown in fig. 4, this embodiment is different from embodiment 1 in that: the crystallization zone is provided with a plurality of distribution plates 16 arranged in the horizontal direction from top to bottom.

Specifically, in this embodiment, a plurality of distribution plates 16 are disposed in the crystallization area from top to bottom along the horizontal direction, so as to redistribute the heat-conducting medium, and prevent the heat-conducting medium outside the crystallization tube from flowing together due to the overlong crystallization tube, thereby causing uneven crystallization.

Example 4

Referring to fig. 6, fig. 6 is a schematic structural diagram of the purification system of the present embodiment.

As shown in fig. 6, the purification system of this example includes a material storage vessel 2 and a falling film crystallizer as shown in example 2.

With continued reference to fig. 6, the material storage container 2 is used as a storage container for uncrystallized material, the upper portion and the lower portion of the material storage container 2 are respectively provided with a feed inlet and a discharge outlet, the feed inlet of the material storage container 2 is communicated with the material outlet 12 of the falling film crystallizer, the discharge outlet of the material storage container 2 is communicated with the material inlet 11 of the falling film crystallizer through a circulating pipeline, and the circulating pipeline is provided with a centrifugal pump 3.

Specifically, in this embodiment, through adding the material storage container 2 to the material outlet 12 of falling film crystallizer is linked together to the feed inlet of material storage container 2, and the material inlet 11 of falling film crystallizer is linked together through the circulation pipeline to the discharge gate of material storage container 2, sets up centrifugal pump 3 on the circulation pipeline, can send into the falling film crystallizer through centrifugal pump 3 and handle once more with uncrystallized material, and then improves raw materials utilization ratio, and improves the yield.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. The falling film crystallizer is characterized by comprising a shell, wherein a material inlet and a material outlet are respectively arranged at the top and the bottom of the shell, a plurality of crystallization tubes are arranged inside the shell, an induced crystallization area and a crystallization area are sequentially arranged between the material inlet and the material outlet, a heat conducting medium inlet, a distribution plate, a heat conducting medium outlet and a bottom plate are sequentially arranged in the induced crystallization area and the crystallization area from top to bottom, the distribution plate is arranged in the horizontal direction, a plurality of deflectors which are in one-to-one correspondence with the crystallization tubes are fixedly arranged on the distribution plate, the deflectors are sleeved outside the crystallization tubes, a top plate which is arranged in the horizontal direction is further arranged between the induced crystallization area and the material inlet, a plurality of through holes which are in one-to-one correspondence with the crystallization tubes are formed in the top plate and the bottom plate, and the top plate are sleeved outside the crystallization tubes through the through holes.

2. The falling film crystallizer according to claim 1, wherein the crystallization zone is provided with a plurality of distribution plates arranged along the horizontal direction from top to bottom.

3. The falling film crystallizer of claim 1, wherein a distributor is disposed within the material inlet.

4. The falling film crystallizer of claim 1, wherein the deflector is annular, the deflector is provided with a deflector inlet, a deflector outlet and a deflector channel positioned between the deflector inlet and the deflector outlet, the deflector channel is tangentially connected with the deflector inlet, the deflector inlet is positioned above the deflector outlet, and the deflector outlet is fixedly arranged on the distribution plate.

5. The falling film crystallizer of claim 4, wherein the flow-directing channel is tangentially connected to the flow-directing outlet;

And/or, a plurality of diversion inlets, diversion outlets and diversion channels positioned between the diversion inlets and the diversion outlets are arranged along the circumferential direction of the diversion device, and the diversion channels are tangentially connected with the corresponding diversion inlets.

6. The falling film crystallizer of claim 4, wherein the width of the guide inlet is 2-8mm.

7. The falling film crystallizer of claim 4, wherein the height of the guide inlet is 2-8mm.

8. The falling film crystallizer of claim 4, wherein the flow guide channel is S-shaped;

And/or, still be equipped with a plurality of cloth membrane ware in the casing, cloth membrane ware is located between distributor and the crystallization pipe, cloth membrane ware and crystallization pipe looks one-to-one and intercommunication.

9. A purification system comprising a falling film crystallizer as in any one of claims 1-8.

10. The purification system of claim 9, wherein the bottom of the crystallization tube is provided with a feed opening, the feed opening is communicated with the material outlet, the purification system further comprises a material storage container, the material storage container is provided with a feed opening and a discharge opening, the feed opening is communicated with the material outlet, the discharge opening is communicated with the material inlet through a circulating pipeline, and a centrifugal pump is arranged on the circulating pipeline.