CN111249764A

CN111249764A - Continuous crystallizer

Info

Publication number: CN111249764A
Application number: CN202010160124.1A
Authority: CN
Inventors: 张平亮
Original assignee: Wuxi Professional College of Science and Technology
Current assignee: Wuxi Professional College of Science and Technology
Priority date: 2020-03-10
Filing date: 2020-03-10
Publication date: 2020-06-09

Abstract

The present invention provides a continuous crystallizer, comprising: the device comprises an inner cylinder, an outer cylinder, a feeding pipe, a driving mechanism, a main shaft, a circulating assembly, a guide cylinder and a sleeve, wherein the inner cylinder and the outer cylinder are mutually nested, the main shaft is axially driven by the driving mechanism and upwards extends into the inner cylinder from the bottom of the inner cylinder, the circulating assembly is connected with the top of the outer cylinder and the bottom of the inner cylinder, the guide cylinder and the sleeve are mutually sleeved and are in an inverted buckle shape, a porous plate is transversely arranged between the guide cylinder and the inner cylinder, a hub assembly accommodated by the guide cylinder is arranged on the main shaft, the main shaft upwards continuously penetrates through the guide cylinder and the sleeve, an impeller is enclosed outside the guide cylinder and connected with the sleeve, the impeller is suspended. By the continuous crystallizer disclosed by the invention, the mother liquor is recycled for crystallization, and the recycled de-gassing and the crystal slurry are recycled, so that the power consumption is obviously reduced, the secondary nucleation rate is reduced, and the grain size of crystals formed by final crystallization is obviously increased.

Description

Continuous crystallizer

Technical Field

The invention relates to the technical field of crystallization equipment, in particular to a continuous crystallizer.

Background

Crystallization is a process of homogeneous reaction of two or more reactants, and the crystallization of a reaction product from a solution is a complex process involving reaction, mass transfer, rapid nucleation and growth and secondary processes which may occur, such as aging, ripening, agglomeration, cracking and the like, and is an efficient and low-consumption separation technique in industrial production. A crystallizer and a crystallization processing device. The existing intermittent crystallizer has the defects of poor crystallization quality, serious deposition and low equipment utilization rate, and needs to develop a novel crystallizer so as to realize the continuity and automation of the crystallization process.

Chinese utility model publication No. CN203389361U discloses an improved evaporation type crystallizer. Elutriation refers to a process of removing some material from a mixture by washing and decanting, and classifying particles using an ascending fluid (often a water or gas stream). This prior art uses a double stirrer and double elutriation column configuration. However, the prior art still has the defects that the crystallization quality is poor, and the crystallization product is easy to block an elutriation column. Meanwhile, the crystallizer disclosed by the prior art has a high secondary nucleation rate, so that the crystallization quality is poor, good mixing conditions cannot be formed, and the average particle size of finally formed crystals is small.

In view of the above, there is a need for an improved crystallization apparatus in the prior art to solve the above problems.

Disclosure of Invention

The invention aims to disclose a continuous crystallizer, which is used for overcoming a plurality of defects in the existing crystallizer, in particular for reducing the energy consumption of the crystallizer, reducing the secondary nucleation rate of crystal grains, improving the grain diameter of finally formed crystals, improving the utilization rate of the continuous crystallizer and reducing the labor intensity.

To achieve the above object, the present invention provides a continuous crystallizer comprising:

the impeller comprises an inner cylinder, an outer cylinder, a feeding pipe, a driving mechanism, a main shaft, a circulating assembly, a guide cylinder, a sleeve and a porous plate, wherein the inner cylinder and the outer cylinder are mutually nested, the main shaft and the driving mechanism are axially driven and extend upwards from the bottom of the inner cylinder to the inner cylinder, the circulating assembly is connected with the top of the outer cylinder and the bottom of the inner cylinder, the guide cylinder and the sleeve are mutually sleeved and are in an inverted buckle shape, the porous plate is transversely arranged between the guide cylinder and the inner cylinder, the main shaft is provided with a hub assembly accommodated by the guide cylinder, the main shaft upwards continuously penetrates through the guide cylinder and the sleeve, the impeller is enclosed outside the guide cylinder and is connected with the sleeve, the impeller is suspended on.

As a further improvement of the invention, an inverted cone top with an emptying hole is formed at the top of the inner cylinder, a discharge pipe is arranged at the bottom of the inner cylinder, the inner cylinder and the outer cylinder form an annular cavity, the annular cavity is communicated with an inner cavity formed by the inner cylinder, a liquid feeding pipe communicated with the annular cavity is arranged at the top of the outer cylinder, and the inner cylinder and the outer cylinder are communicated with each other; the continuous crystallizer further comprises: a corrugated baffle, and a plurality of hanger rods suspending the corrugated baffle.

As a further improvement of the invention, the circulating component comprises a circulating pipe connected with a circulating port of the outer cylinder, a circulating pump, a fine grain dissolver, a return pipe connected with the fine grain dissolver and communicated with the bottom of the inner cylinder, and a tee joint; the tee joint is connected with a circulating pipe, a circulating pump and a fine grain dissolver.

As a further development of the invention, the hub assembly comprises: perpendicular oar subassembly that spins, the symmetry sets up in the last kuppe and the kuppe down of perpendicular oar subassembly that spins about the perpendicular oar subassembly to and a plurality of horizontal oar that radially connects perpendicular oar subassembly that spins, the main shaft is connected jointly to the horizontal oar that spins, and two adjacent horizontal oar that spins form the clearance that supplies liquid upflow, go up kuppe and kuppe axial parcel down the main shaft.

As a further improvement of the invention, the vertical propeller assembly forms a first annular channel with the inner wall surface of the guide shell in the horizontal radial direction; the impeller and the inner wall surface of the inner cylinder form a second annular channel in the horizontal radial direction, and the impeller is used for pushing liquid to flow back to the bottom of the inner cylinder.

As a further improvement of the invention, the hub assembly and the impeller are arranged in a vertically staggered manner, and the hub assembly is positioned below the impeller.

As a further improvement of the invention, the feeding pipe extends obliquely upwards into the inner cylinder and extends into an open area formed at the bottom of the guide cylinder.

As a further improvement of the present invention, the driving mechanism includes an axially assembled motor and a speed reducer, and the speed reducer is assembled to the bottom of the inner cylinder through a flange.

As a further improvement of the invention, the guide cylinder and the sleeve are axially arranged at intervals and form a cylindrical cavity.

As a further improvement of the invention, the end of the spindle extending out of the sleeve is provided with a flat balance block;

the continuous crystallizer further comprises an inner ring bearing, an outer ring bearing and a plurality of inner link rods transversely clamped by the inner ring bearing and the outer ring bearing, the main shaft penetrates through the inner ring bearing, and the outer ring bearing is clamped on the inner wall of the guide cylinder.

Compared with the prior art, the invention has the beneficial effects that:

by the continuous crystallizer disclosed by the invention, the mother liquor is circularly crystallized, and the circulating de-gassing and the crystal slurry are circulated, so that the power consumption is obviously reduced; meanwhile, by the technical scheme disclosed by the invention, the secondary nucleation rate can be reduced, so that the grain size of the crystal formed by final crystallization is increased. The continuous crystallizer disclosed by the invention has the advantage of higher production efficiency, can reduce the labor intensity of operators and has good practicability.

Drawings

FIG. 1 is a schematic view of the overall structure of a continuous crystallizer according to the present invention;

FIG. 2 is a transverse cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a transverse cross-sectional view taken along line B-B of FIG. 1;

FIG. 4 is a top view of the hub assembly;

fig. 5 is an axial cross-sectional view of the sleeve.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

The terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention.

It should be noted that, the drawings of the present application are drawn by simple drawing, and the wall thickness is ignored, for example, the inner cylinder 14 and the outer cylinder 6 can be made of metal plate with a thickness of 1-5 mm in the actual manufacturing process, and are preferably made of stainless steel. Meanwhile, in the present embodiment, the term "liquid" is a generic concept of "mother liquor" or "saturated feed liquid".

Specifically, please refer to fig. 1 to 5, which illustrate an embodiment of a continuous crystallizer 100 according to the present invention.

The continuous crystallizer 100 of the present embodiment includes: the device comprises an inner cylinder 14, an outer cylinder 6, a feeding pipe 5, a driving mechanism, a main shaft 4, a circulating component, a guide cylinder 7, a sleeve 28, a porous plate 8 and a ring-shaped porous plate 8, wherein the inner cylinder 14 and the outer cylinder 6 are mutually nested, the feeding pipe 5 and the driving mechanism are axially driven by the driving mechanism and extend upwards from the bottom of the inner cylinder 14 to enter the inner cylinder 14, the circulating component is connected with the top of the outer cylinder 6 and the bottom of the inner cylinder 14, the guide cylinder 7 and the sleeve 28 are mutually nested. The main shaft 4 is provided with a hub assembly 23 housed by the guide shell 7. The main shaft 4 continuously penetrates through the guide shell 7 and the sleeve 28 upwards, and the impeller 26 which is enclosed outside the guide shell 7 and is connected with the sleeve 28 is suspended on the upper surface of the perforated plate 8, and the hub assembly 23, the sleeve 28 and the impeller 26 are simultaneously driven by the main shaft 4 to axially rotate. The porous plate 8 may be made of polytetrafluoroethylene, and has circular, elliptical, etc. through holes formed in the surface thereof.

Referring to fig. 5, the sleeve 28 forms a through hole 282 for the spindle 4 to pass through, and the spindle 4 and the sleeve 28 can be securely fixed by welding or other methods known in the art and form an integral structure. The above-mentioned components included in the continuous crystallizer 100 may be made of stainless steel.

Specifically, in the present embodiment, as shown in fig. 1, the driving mechanism includes a motor 1 and a speed reducer 3 which are axially assembled, and the speed reducer 3 is assembled to the bottom of the inner cylinder 14 through a flange 2. The guide cylinder 7 is axially spaced from the sleeve 28 and forms a cylindrical cavity 71. The main shaft 4 is coaxially assembled with the reducer 3 and axially rotates along the central axis 200 to drive the hub assembly 23, the sleeve 28 and the impeller 26 to axially rotate, so as to drive the saturated feed liquid to circulate in the directions indicated by the dotted arrows F, D and E in fig. 1.

As shown in fig. 1, the circulation member is provided outside the outer tub 6. The circulation component comprises a circulation pipe 17 connected with a circulation port 15 of the outer cylinder 6, a circulation pump 18, a fine grain dissolver 20, a return pipe 21 connected with the fine grain dissolver 20 and leading to the bottom of the inner cylinder 14, and a tee joint 19. The tee 19 is connected with the circulating pipe 17, the circulating pump 18 and the fine grain dissolver 20. The liquid in the annular cavity 61 formed by the inner cylinder 14 and the outer cylinder 6 (the liquid contains the precipitated fine crystals) flows back to the bottom of the inner cylinder 14 from the circulating port 15 along the circulating pipe 17, and the liquid containing the fine crystals is pumped into the fine crystal dissolver 20 under the driving of the circulating pump 18.

The fine crystal dissolver 20 in this embodiment functions to eliminate and dissolve fine crystals in the liquid, to improve the stability of the flow of the liquid in the circulating assembly, and to make the liquid have good fluidity; meanwhile, in the present embodiment, it is also possible to effectively prevent fine crystals contained in the liquid from clogging the circulation pipe 17 by providing the fine crystal dissolver 20.

As shown in fig. 1, a flat balance weight 27 is disposed at the end of the spindle 4 extending out of the sleeve 28. The balance weight 27 is preferably a solid ring, so that the balance weight 27 can counteract slight vibration and resonance that may occur during the axial rotation of the main shaft 4 along the central axis 200.

Referring to fig. 3, in this embodiment, the continuous crystallizer 100 further includes an inner ring bearing 291, an outer ring bearing 292, and a plurality of inner links 30 laterally clamped by the inner ring bearing 291 and the outer ring bearing 292, the main shaft 4 penetrates through the inner ring bearing 291, and the outer ring bearing 292 is clamped on the inner wall of the draft tube 7. Specifically, the inner race bearing 291 and the outer race bearing 292 laterally sandwich the four inner links 30 and form four fan-shaped passages 271 through the four inner links 30. Hub assembly 23 rotates to drive liquid upward in the direction shown by arrow F and through the four fan-shaped channels 271.

At the same time, the top of the guide shell 7 forms a fan-shaped or circular channel for the liquid to continue to flow upwards along arrow D. Referring to fig. 2, the top of the sleeve 28 is provided with four fan-shaped through holes 281, and the four connecting rods 29 connect the side wall of the sleeve 28 and the main shaft 4. The liquid in the guide shell 7 continues to flow through the four fan-shaped through holes 281 in the direction of the arrow D, flows downward in the direction of the arrow D, and flows back down to the bottom of the inner cylinder 14 through the second annular channel 42.

The top of inner tube 14 forms back taper top 10 of taking evacuation hole 11, the bottom of inner tube 14 sets up discharging pipe 22, inner tube 14 forms annular cavity 61 with urceolus 6, the interior cavity 140 that annular cavity 61 and inner tube 14 formed communicates each other. In the present embodiment, the inner cylinder 14 and the outer cylinder 6 are communicated with each other at the bottom, and a liquid flow path is established between an inner cavity 140 formed by the inner cylinder 14 and an annular cavity 61 formed by nested enclosure of the inner cylinder 14 and the outer cylinder 6 through a plurality of through holes 142 formed in the side wall of the bottom of the inner cylinder 14. Meanwhile, the through holes 142 are all distributed around the lower part of the perforated plate 8, a primary circulation area is formed above the perforated plate 8, and a secondary circulation area is formed below the perforated plate 8.

In this embodiment, the return pipe 21 extends into the open area formed by the bottom of the guide shell 7 and the end of the inner cylinder 14, and is located below the perforated plate 8, so that the liquid pumped into the inner cylinder 14 again through the return pipe 21 can be fully mixed with the liquid in the secondary circulation area formed below the perforated plate 8, and the liquid (i.e. saturated liquid) is pushed to be gathered more intensively in the direction shown by the arrow F and flows upwards through the cylindrical passage formed by the guide shell 7.

In the continuous crystallizer 100, the saturated feed liquid is circulated and crystallized in the directions indicated by the dotted arrows F, D, and E in fig. 1. The saturated feed liquid flowing back to the bottom of the inner cylinder 14 flows into the annular chamber 61 through the plurality of through holes 142 formed in the side wall of the bottom of the inner cylinder 14. The liquid in the annular chamber 61 flows upward in the direction shown by the dotted arrow G and flows into the circulation pipe 17 from the circulation port 15; then, the fine crystals are removed by the fine crystal dissolver 20 included in the circulation unit and then re-flow into the inner cavity 140 formed by the inner cylinder 14, and the circulation crystallization is performed in the directions indicated by the broken line arrow F, the broken line arrow D, and the broken line arrow E in fig. 1 in a reciprocating manner.

In this embodiment, the inner cavity 140 forms a crystal growth zone, and the annular cavity 61 and the circulation assembly form a crystal clarification zone; wherein, the crystal growth area is used for carrying out nucleation growth of a crystalline solid phase, and the crystal clarification area is used for carrying out washing and dissolution of fine crystals (the grain diameter is usually less than 50 microns).

As shown in fig. 5, the feeding pipe 5 extends obliquely upward into the inner cylinder 14 and into the open area formed at the bottom of the guide cylinder 7, so that a good mixing condition can be formed at the bottom of the inner cylinder 14. The saturated feed liquid is pumped into the inner barrel 14 in the direction shown by arrow 51 in fig. 1. Saturated feed liquid is obliquely and upwards pumped into the inner cylinder 14, and the tail end of the feeding pipe 5 is positioned in an open area formed at the bottom of the guide shell 7, so that crystal nucleation can be promoted in the open area at the bottom of the guide shell 7, energy consumption required by the paddle hub assembly 23 for pushing the liquid to upwards flow can be reduced, and the overall energy consumption of the continuous crystallizer 100 is reduced to a certain extent; meanwhile, the secondary nucleation rate of the bottom opening area of the guide shell 7 can be reduced, so that the secondary nucleation rate is reduced, the average grain size of finally prepared crystals is improved, the grain size of the crystals is uniform, and the crystal quality is obviously improved.

In this embodiment, the top of the outer cylinder 6 is provided with a filling pipe 9 communicating with the annular chamber 61, and the inner cylinder 14 and the outer cylinder 6 communicate with each other. The continuous crystallizer further comprises: a corrugated baffle 12, and a plurality of hanger bars 13 suspending the corrugated baffle 12. Specifically, the suspension rod 13 is a rigid rod-shaped member. The corrugated baffle 12 forms a slit in the horizontal direction for fine crystals to fall down (not shown in view of the small slit).

The gas carrying fine particles generated in the process of circulating crystallization of saturated feed liquid is blocked by the corrugated baffle 12, fine crystals fall downwards from the gap of the corrugated baffle 12, and the gas is discharged out of the inner cylinder 14 through the vent 11 on the inverted cone top 10. Meanwhile, the top of the outer cylinder 6 is lower than the lower edge opening of the inverted cone top 10 of the inner cylinder 14, and under the combined action of the circulation opening 15, the phenomenon that the corrugated baffle 12 is submerged in saturated feed liquid in the rising process of the inner cylinder 14 is avoided.

Referring to fig. 1, the liquid feeding tube 9 is used for feeding various solvents required in the crystallization process of the saturated feed liquid required in the cyclic crystallization of the saturated feed liquid, such as a potassium nitrate solution, a sodium nitrate solution, a magnesium sulfate solution, and the like, and can be appropriately selected according to the specific type of the saturated feed liquid. In view of the technical solution of the present embodiment of the crystallization process of the non-saturated liquid, the kind, concentration and temperature of the solvent added to the liquid feeding tube 9 are not specifically limited in this embodiment.

As shown in fig. 1 and 4, in the present embodiment, the hub assembly 23 includes: perpendicular oar subassembly 25, the symmetry sets up in the last kuppe 231 and the lower kuppe 232 of perpendicular oar subassembly 25 upper and lower both sides to and a plurality of horizontal oar 24 of radially connecting perpendicular oar subassembly 25, horizontal oar 24 connects main shaft 4 jointly, and two adjacent horizontal oar 24 forms the clearance 241 that supplies liquid upflow, go up kuppe 231 and kuppe 232 axial parcel down main shaft 4.

Specifically, in the present embodiment, the upper and lower fairings 231 and 232 are both designed to have bullet streamline shapes, so as to reduce the resistance and turbulence of the liquid flowing upward along the arrow F, and effectively prevent the deposited crystals from accumulating in the corner where the hub assembly 23 meets the main shaft 4, so as to overcome the defect that the conventional crystallization apparatus is prone to deposit crystal scale, and indirectly improve the purity of different kinds of crystals produced by using the continuous crystallizer 100.

In the present embodiment, the vertical paddle assembly 25 is composed of a plurality of metal fins 251 annularly arranged around the main shaft 4. The upper air guide sleeve 231 and the lower air guide sleeve 232 are vertically penetrated by the main shaft 4 and connected with a plurality of horizontal propellers 24.

In the present embodiment, the vertical propeller assembly 25 forms a first annular channel 45 with the inner wall surface of the guide cylinder 7 in the horizontal radial direction. The impeller 26 forms a second annular channel 42 with the inner wall surface of the inner barrel 14 in a horizontal radial direction, the impeller 26 serving to urge liquid back down to the bottom of the inner barrel 14. The hub assembly 23 and the impeller 26 are vertically arranged in a staggered manner, and the hub assembly 23 is positioned below the impeller 26. Through this technical scheme, help maintaining the saturated feed liquid in the inner tube 14 and be in stable supersaturation, prevent to produce the fluctuation of supersaturation in the local range to be favorable to the growth of large granule crystal and the dissolution of fine particle crystal.

The liquid pumped into the bottom of the inner cylinder 14 again by the circulating component is sucked into the guide cylinder 7 again by the opening formed at the lower end of the guide cylinder 7, and when the liquid flows back to the bottom of the inner cylinder 14 downwards along the dotted arrow E, the liquid is mixed with the mother liquid (namely the residual saturated feed liquid formed after crystallization) in a mother liquid circulating crystallization mode, so that the saturated feed liquid (namely the mother liquid) dissolved with the fine crystals at the bottom of the guide cylinder 7 is fully mixed with the liquid flowing back to the bottom of the inner cylinder 14, and the rapid growth of the crystals is facilitated.

As shown in FIG. 1, the slurry containing large-particle crystals finally formed in the continuous crystallizer 100 is discharged from the inner cylinder 14 through a discharge pipe 22 provided at the bottom of the inner cylinder 14. The crystal slurry is a suspension of crystals formed by crystallization and the rest solution. The continuous crystallizer 100 disclosed in this embodiment reduces the secondary nucleation rate, increases the grain size of the crystal finally crystallized, and has the advantages of high production efficiency, low labor intensity of the operator, high practicability, and the like.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A continuous crystallizer, characterized in that it comprises:

the device comprises an inner cylinder (14), an outer cylinder (6), a feeding pipe (5), a driving mechanism, a main shaft (4), a circulating assembly, a guide cylinder (7), a sleeve (28), a porous plate (8) and an impeller (26), wherein the inner cylinder (14) and the outer cylinder (6) are mutually nested, the main shaft (4) is axially driven by the driving mechanism and upwards extends into the inner cylinder (14) from the bottom of the inner cylinder (14), the circulating assembly is connected with the top of the outer cylinder (6) and the bottom of the inner cylinder (14), the guide cylinder (7) and the sleeve (28) are mutually sleeved and are in an inverted buckle shape, the porous plate (8) is transversely arranged between the guide cylinder (7) and the inner cylinder (14), the main shaft (4) is provided with the hub assembly (23) accommodated by the guide cylinder (7), the main shaft (4) upwards continuously penetrates through the guide cylinder (7) and the sleeve (28) and the impeller (26) is enclosed outside the guide cylinder (7) and, The sleeve (28) and the impeller (26) rotate axially.

2. The continuous crystallizer according to claim 1, characterized in that the top of the inner cylinder (14) forms an inverted cone top (10) with a vent hole (11), the bottom of the inner cylinder (14) is provided with a discharge pipe (22), the inner cylinder (14) and the outer cylinder (6) form an annular cavity (61), the annular cavity (61) and the inner cavity (140) formed by the inner cylinder (14) are communicated with each other, the top of the outer cylinder (6) is provided with a liquid feeding pipe (9) communicated with the annular cavity (61), and the inner cylinder (14) and the outer cylinder (6) are communicated with each other; the continuous crystallizer further comprises: a corrugated baffle (12), and a plurality of hanger rods (13) suspending the corrugated baffle (12).

3. The continuous crystallizer according to claim 1, characterized in that said circulation assembly comprises a circulation pipe (17) connected to the circulation port (15) of the outer drum (6), a circulation pump (18), a fine-grain dissolver (20), a return pipe (21) connected to the fine-grain dissolver (20) and opening into the bottom of the inner drum (14), and a tee (19); the tee joint (19) is connected with the circulating pipe (17), the circulating pump (18) and the fine grain dissolver (20).

4. Continuous crystallizer as in claim 1, characterized in that said hub assembly (23) comprises: perpendicular oar subassembly (25) of rotating, the symmetry sets up in perpendicular oar subassembly (25) about both sides go up kuppe (231) and kuppe (232) down to and a plurality of horizontal oar (24) of rotating perpendicularly oar subassembly (25) are radially connected, main shaft (4) are connected jointly in horizontal oar (24), and two adjacent horizontal oar (24) form and supply clearance (241) that liquid upwards flows, go up kuppe (231) and kuppe (232) axial parcel down main shaft (4).

5. Continuous crystallizer as in claim 4, characterized in that said vertical propeller assembly (25) forms a first annular channel (45) with the inner wall surface of the guide shell (7) in a horizontal radial direction; the impeller (26) forms a second annular channel (42) with the inner wall surface of the inner cylinder (14) in the horizontal radial direction, and the impeller (26) is used for pushing the liquid to flow back to the bottom of the inner cylinder (14) downwards.

6. Continuous crystallizer as in claim 5, characterized in that said hub assembly (23) is vertically offset from the impeller (26) and in that the hub assembly (23) is located below the impeller (26).

7. Continuous crystallizer as in claim 1, characterized in that said feeding pipe (5) extends obliquely upwards into said inner drum (14) and into the open area formed by the bottom of the guide shell (7).

8. Continuous crystallizer as in claim 1, characterized in that said driving mechanism comprises an axially assembled motor (1) and reducer (3), said reducer (3) being assembled to the bottom of said inner drum (14) through a flange (2).

9. Continuous crystallizer as in claim 1, characterized in that said guide shell (7) is axially spaced from the sleeve (28) and forms a cylindrical cavity (71).

10. Continuous crystallizer as in claim 1, characterized in that the end of the main shaft (4) that extends beyond the sleeve (28) is equipped with a flattened counterweight (27);

the continuous crystallizer further comprises an inner ring bearing (291), an outer ring bearing (292) and a plurality of inner link rods (30) which are transversely clamped by the inner ring bearing (291) and the outer ring bearing (292), the main shaft (4) penetrates through the inner ring bearing (291), and the outer ring bearing (292) is clamped on the inner wall of the guide cylinder (7).