CN114405050A - Continuous rotational flow falling film melting crystallizer - Google Patents

Abstract

The invention belongs to the field of crystallization equipment, and particularly discloses a continuous rotational flow falling film melting crystallizer which comprises a material distribution pipe network and a plurality of crystallization pipes, wherein the material distribution pipe network comprises a plurality of liquid separation heads, the tops of the crystallization pipes are communicated with rotational flow film distribution heads, the inner walls of the rotational flow film distribution heads are provided with first spiral flow guide grooves, the rotational flow film distribution heads are in one-to-one correspondence with the liquid separation heads, and an emptying channel is reserved between the rotational flow film distribution heads and the corresponding liquid separation heads. According to the invention, the rotational flow film distribution head can enable materials to enter the crystallization tube in a rotational flow mode, so that the materials have a circumferential initial speed, the radial gathering situation of the materials is slowed down, the emptying channel can be used for discharging air in the crystallization tube, and the materials can form rotational flow, so that the materials can be uniformly formed into a film on the wall of the crystallization tube, the crystallization is more uniform, the uniformity of the crystallization thickness is improved, and the crystals are not easy to fall off; and the material is coated on the wall of the crystallization tube in a rotational flow mode, so that the flow rate of the material is improved, the crystallization time is effectively shortened, and the crystallization efficiency is improved.

Description

Continuous rotational flow falling film melting crystallizer

Technical Field

The invention relates to the field of crystallization equipment, in particular to a continuous rotational flow falling film melting crystallizer.

Background

In the existing falling film crystallization equipment, a distributor is usually adopted to distribute materials or a cooling and heating medium to the inner wall and the outer wall of a crystallization tube, and the flow velocity of the materials or the cooling and heating medium is controlled to enable the materials or the cooling and heating medium to flow downwards along the tube wall of the crystallization tube in a film shape under the action of gravity. In order to maintain good film forming effect, the flow rate of the material or the cooling and heating medium is very slow, so that the crystallization process takes long time and the crystallization efficiency is low. And, because the crystallization tube is usually the circular tube, consequently, material or cold and hot medium can be radial gathering situation under the action of gravity for material or cold and hot medium distributes unevenly, and the film that material or cold and hot medium formed on the pipe wall is discontinuous in circumference, leads to heat transfer area to reduce, and heat exchange efficiency reduces, and radial upward crystallization thickness of crystallization tube is greater than circumference crystallization thickness, and the crystallization thickness of crystallization tube upper portion is greater than the crystallization thickness of crystallization tube lower part. Along with the non-uniformity of the crystallization thickness, the heat transfer effect is further influenced, the time required by the crystallization or melting process is prolonged, more energy is consumed, and the energy conservation and emission reduction are not facilitated.

In addition, because the crystallization thickness on the crystallization tube is uneven, the crystallization is subjected to the impact action of the material from top to bottom and the self gravity action of the crystallization, so that the crystallization is easy to fall off from the tube wall, the crystallization is re-melted in the material, and the crystallization time and energy loss are increased. In addition, when the dropped crystals are large, the crystals may be jammed, so that impurities are easily wrapped in the crystals, and meanwhile, sweat cannot be removed when the jammed crystals are subjected to a sweating operation, thereby affecting the purity of the final product.

In summary, in the chemical continuous production process of the existing falling film melting crystallizer, due to poor uniformity of the crystallization thickness, the crystallization is easy to fall off, the production rate is limited, the energy consumption is increased, and the continuity is poor.

Disclosure of Invention

In view of the above disadvantages of the prior art, the present invention provides a continuous cyclone falling film melting crystallizer for solving the problem of poor uniformity of crystalline thickness of the falling film melting crystallizer during crystallization.

In order to achieve the above and other related objects, the present invention provides a continuous cyclone falling film melting crystallizer, which comprises a material distribution pipe network and a plurality of crystallization pipes, wherein the material distribution pipe network comprises a plurality of liquid separation heads, the tops of the crystallization pipes are communicated with a cyclone film distribution head, the inner wall of the cyclone film distribution head is provided with a first spiral guide groove, the cyclone film distribution heads are in one-to-one correspondence with the liquid separation heads, and an evacuation channel is left between the cyclone film distribution head and the corresponding liquid separation head.

As described above, the continuous cyclone falling film melting crystallizer of the present invention has the following beneficial effects:

according to the invention, the material enters the crystallization tube in a rotational flow mode through the spiral flow guide groove I on the inner wall of the rotational flow film distribution head, so that the material has a circumferential initial speed after entering the crystallization tube, the radial gathering situation of the material can be slowed down, and the material can be uniformly formed into a film on the wall of the crystallization tube.

Moreover, the material is with the mode cloth membrane of whirl to the crystallization tube wall on, the material velocity of flow has promoted 1 ~ 2 times when comparing the nature cloth membrane to it is long effectively to shorten the crystallization, improves crystallization efficiency, improve equipment continuous production ability. Meanwhile, compared with the prior art that the crystallization thickness of the upper part of the crystallization tube is larger than that of the lower part of the crystallization tube during natural film distribution, the crystallization device can ensure that the crystallization thickness of the upper part and the lower part of the crystallization tube is more uniform, reduce the material impact force on the crystallization of the lower part of the crystallization tube, ensure that the crystallization tube is not easy to fall off and block, ensure that the sweating process is smoothly carried out, and further ensure the purity of the final product.

Optionally, a vent pipe is arranged in the rotational flow film distribution head, a flow guide table is arranged at the top end of the vent pipe, and a plurality of vent holes are formed in the side wall of the vent pipe.

When the material got into whirl cloth membrane head by the branch liquid head, partial material probably directly drips to in the crystallizer, and partial material will not flow into in the whirl cloth membrane head along the inner wall of branch liquid head promptly, and at this moment, the water conservancy diversion platform in this scheme then can prevent this part material directly to drip to in the crystallizer to on the inner wall of whirl cloth membrane head with this part material dispersion, make its formation whirl under the water conservancy diversion effect of spiral guiding gutter one. And, in this scheme, the air vent on the breather pipe can be sheltered from to the water conservancy diversion platform, avoids the air vent to be sealed by material liquid to ensure that the air in the crystallizer can be discharged through breather pipe, air vent, evacuation passageway.

Optionally, a plurality of first spiral flow guide strips are arranged on the inner wall of the spiral flow film distribution head, a first spiral flow guide groove is formed between every two adjacent first spiral flow guide strips, and the bottom end of the vent pipe is connected with the first spiral flow guide strips.

In this scheme, spiral guiding gutter one on the first inner wall of whirl cloth membrane is formed by two adjacent spiral water conservancy diversion strips one to, breather pipe and spiral water conservancy diversion strip one are connected, provide the installation site for the breather pipe, and make to have the space that supplies the material to flow in the crystallization pipe between breather pipe and the whirl cloth membrane head, avoid the breather pipe to influence the material and form the whirl.

Optionally, the top surface of the diversion table is spherical, and a convex surface of the diversion table faces the liquid separation head.

In this scheme, when the top surface of water conservancy diversion platform was the sphere form, can disperse the material of drippage on the water conservancy diversion bench better.

Optionally, a second spiral diversion trench is formed in the inner wall of the liquid separation head.

In this scheme, be equipped with spiral guiding gutter two on the inner wall of liquid separation head to make liquid separation head can improve the speed of material whirl with the cooperation of whirl cloth membrane head, thereby promote material whirl cloth membrane and material circumferential motion trend.

Optionally, the bottom end of the liquid separation head is located in the swirling flow membrane distribution head.

In this scheme, when the bottom of liquid separation head was located whirl cloth membrane head in, can ensure that the material can not the splash whirl cloth membrane head after the liquid separation head of autoecing flows to avoid the waste of material.

Optionally, the rotational flow film distribution head comprises a rotational flow part and a straight pipe part, the first spiral guide groove is arranged on the inner wall of the rotational flow part, and the inner diameter of the vent pipe is 1/3-1/2 of the inner diameter of the straight pipe part.

In the scheme, the inner diameter of the vent pipe is limited to 1/3-1/2 of the inner diameter of the straight pipe part, so that enough discharge space is provided for air in the crystallization pipe.

Optionally, the diversion platform is located at 1/3-1/2 of the height of the swirling part, and the diameter of one end, close to the vent pipe, of the diversion platform is larger than the outer diameter of the vent pipe.

In the scheme, the guide table is limited to be positioned at 1/3-1/2 of the height of the rotational flow part, so that materials can be prevented from dropping on the guide table and splashing out of the rotational flow film distribution head; the diameter of the guide table close to one end of the vent pipe is limited to be larger than the outer diameter of the vent pipe, so that the guide table can completely shield the vent pipe.

Optionally, the crystallizer still includes heating medium guide plate and a plurality of heating medium pipe, set up a plurality of confessions on the heating medium guide plate the water conservancy diversion hole that the crystallization pipe runs through is seted up on the heating medium guide plate and is supplied heating medium pipe male recess, the one end that the recess was kept away from in the water conservancy diversion hole is equipped with the round chamfer that is used for the water conservancy diversion.

In this scheme, be used for the round chamfer of water conservancy diversion on the water conservancy diversion hole, can make the cold and hot medium flow in the water conservancy diversion downthehole back, at the outer wall of crystallization pipe on the film-forming to realize two falling liquid film melt crystallization.

Optionally, a filter screen for collecting crystals is arranged below the crystallization tube.

In this scheme, the crystallization that drops from the crystallization pipe wall can be collected to the filter screen of crystallization pipe below, avoids the crystallization to get into the material ejection of compact pipeline that is located the crystallization pipe below to the crystallization of avoiding dropping blocks up material ejection of compact pipeline. And the crystals on the filter screen can be melted under the heating of a molten product formed after the crystals are melted on the crystallization pipe and then separated with the product, so that the product yield is ensured, and the continuous production of equipment is facilitated.

Drawings

Fig. 1 is a longitudinal sectional view of a continuous cyclone falling film melt crystallizer according to an embodiment of the present invention;

FIG. 2 is a bottom view of the material distribution pipe network of FIG. 1;

FIG. 3 is an enlarged view of the dispensing head of FIG. 2;

FIG. 4 is a cross-sectional view taken along the line B-B in FIG. 3 (the second helical guide strip is not shown);

FIG. 5 is a top view of the spiral flow film laying head of FIG. 1;

FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5;

FIG. 7 is an axial sectional view of the cyclone film spreading head mounted on the top of the crystallization tube;

FIG. 8 is an enlarged view of A in FIG. 1;

fig. 9 is a plan view of the refrigerant/heating medium guide plate of fig. 1;

FIG. 10 is a cross-sectional view taken along line C-C of FIG. 9;

FIG. 11 is a longitudinal sectional view of the crystallization tube and the cold and hot medium tube in cooperation with the cold and hot medium baffle;

FIG. 12 is an axial sectional view of a spin-on-film-dispensing head mounted on the top of a crystallization tube in accordance with a second embodiment of the present invention;

fig. 13 is a diagram illustrating a positional relationship between the liquid distribution head and the spiral flow film distribution head according to the third embodiment of the present invention.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated. The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention. Moreover, the specific process parameters and the like in the following examples are also only one example of suitable ranges, and a person skilled in the art can select the process parameters and the like within the suitable ranges through the description of the invention, and the process parameters and the like are not limited to the specific values exemplified below.

Reference numerals in the drawings of the specification include: the device comprises a shell 1, a feeding pipe 2, a discharging pipe 3, a material distribution pipe network 4, a material branch pipe 410, a liquid separation head 420, a spiral guide groove II 421, a spiral guide strip II 422, an arc pipe 430, a cold and hot medium guide plate 5, a guide hole 501, a groove 502, a crystallization pipe 6, a cold and hot medium pipe 7, a spiral film distribution head 8, a cyclone part 810, a spiral guide groove I811, a spiral guide strip I812, a straight pipe part 820, an emptying channel 9, a vent pipe 10, a vent hole 101, a guide table 11, an upper clamp plate I12, a lower clamp plate I13, an upper clamp plate II 14, a lower clamp plate II 15, a filter screen 16, an air overflow port 17, a cold and hot medium inlet and outlet pipe 18 and an overflow pipe 19.

Example one

This embodiment is substantially as shown in fig. 1: the utility model provides a continuous type whirl falling film melt crystallizer, which comprises a housin 1, inlet pipe 2 and discharging pipe 3, the inside of casing 1 is equipped with material distribution pipe network 4, cold and hot medium guide plate 5, a plurality of crystallization pipe 6 and a plurality of cold and hot medium pipe 7, combine and show in figure 2, material distribution pipe network 4 includes a plurality of material branch pipes 410 and a plurality of branch liquid head 420, inlet pipe 2 and material branch pipe 410 intercommunication, in the embodiment, the quantity of material branch pipe 410 is six, and the one end intercommunication that six material branch pipes 410 are close to each other, and this intercommunication department also is material branch pipe 410 and inlet pipe 2's intercommunication department. The two adjacent material branch pipes 410 are also communicated with each other through arc pipes 430, and in this embodiment, three arc pipes 430 are designed between the two adjacent material branch pipes 410. The liquid separation heads 420 are installed on the material branch pipes 410 and the arc pipes 430, in this embodiment, the number of the liquid separation heads 420 is 37, and the 37 liquid separation heads 420 are uniformly distributed on the material branch pipes 410 and the arc pipes 430. Referring to fig. 3 and 4, a second spiral guide groove 421 is formed in the inner wall of the liquid separation head 420, specifically, a plurality of second spiral guide strips 422 are formed on the inner wall of the liquid separation head 420, and a second spiral guide groove 421 is formed between two adjacent second spiral guide strips 422.

The number of the crystallization tubes 6 is the same as that of the liquid separation heads 420, the top ends of the crystallization tubes 6 are communicated with the rotational flow film distribution heads 8, and the rotational flow film distribution heads 8 correspond to the liquid separation heads 420 one by one. Referring to fig. 5, 6 and 7, the spiral film-distributing head 8 includes a spiral flow portion 810 and a straight pipe portion 820, a first spiral guide groove 811 is provided on an inner wall of the spiral flow portion 810, specifically, a plurality of first spiral guide strips 812 are provided on an inner wall of the spiral flow portion 810, a first spiral guide groove 811 is formed between two adjacent first spiral guide strips 812, in this embodiment, the number of the first spiral guide strips 812 is eight, the number of the first spiral guide grooves 811 is eight, and the first spiral guide strips 812 and the spiral flow portion 810 are integrally formed. In this embodiment, the second spiral guide groove 421 on the inner wall of the liquid separation head 420 and the first spiral guide groove 811 on the inner wall of the spiral film distribution head 8 both make the material generate a counterclockwise rotational flow (as viewed from top to bottom in fig. 1), but it should be noted that those skilled in the art can adjust the rotational flow direction and rotational flow angle according to the geographical location of the implementation place. Referring to fig. 8, the inner diameter of the top end of the swirling portion 810 is larger than the inner diameter of the bottom end of the liquid-separating head 420, and the swirling portion 810 is aligned with the corresponding liquid-separating head 420, that is, the central axis of the swirling portion 810 coincides with the central axis of the corresponding liquid-separating head 420, and an evacuation channel 9 is left between the swirling portion 810 and the corresponding liquid-separating head 420.

As shown in fig. 6 and 7, a vent pipe 10 is arranged in the swirling part 810, the bottom end of the vent pipe 10 is connected with a first spiral flow guide strip 812, the inner diameter of the vent pipe 10 is 1/3-1/2 of the inner diameter of the straight pipe part 820, and a plurality of vent holes 101 are formed in the side wall of the vent pipe 10. In this embodiment, the bottom end of the vent pipe 10 is welded to the first spiral guide strip 812, the inner diameter of the vent pipe 10 is 1/3 of the inner diameter of the straight pipe 820, the number of the vent holes 101 is four, and the four vent holes 101 are uniformly distributed on the circumferential wall of the upper part of the vent pipe 10. The top end of the vent pipe 10 is integrally formed with a flow guide table 11, the top surface of the flow guide table 11 is spherical, the convex surface of the flow guide table 11 faces upwards, the flow guide table 11 is located at 1/3-1/2 of the height of the rotational flow part 810, and the diameter of the bottom end of the flow guide table 11 is larger than the outer diameter of the vent pipe 10 and smaller than the inner diameter of the straight pipe part 820. The guide table 11 is located at 1/3-1/2 of the height of the swirling part 810, which means that the top of the guide table 11 is located at 1/3-1/2 of the height of the swirling part 810. In this embodiment, the top of the guide table 11 is located at 1/2 of the height of the swirling part 810, and the diameter of the bottom of the guide table 11 is 4/5 of the inner diameter of the straight pipe part 820. In this embodiment, when a part of the material directly drops into the swirling flow film distributing head 8 from the liquid separating head 420, the part of the material is dispersed onto the inner wall of the swirling flow portion 810 by the flow guiding table 11, so that the material forms a swirling flow under the guiding action of the spiral flow guiding groove one 811, and thus, the part of the material is prevented from directly dropping into the crystallization tube 6, and the crystallization efficiency is improved.

The circumferential side wall of the cold and hot medium guide plate 5 is welded on the inner circumferential wall of the shell 1, and as shown in fig. 9, fig. 10 and fig. 11, the cold and hot medium guide plate 5 is provided with a plurality of guide holes 501 for the crystallization tubes 6 to pass through, in this embodiment, the number of the guide holes 501 is the same as that of the crystallization tubes 6, and the guide holes 501 correspond to the crystallization tubes 6 one to one. The bottom surface of the cooling and heating medium guide plate 5 is provided with a groove 502 for inserting the cooling and heating medium pipes 7, in the embodiment, the number of the cooling and heating medium pipes 7 is the same as that of the crystallization pipes 6, the cooling and heating medium pipes 7 correspond to the crystallization pipes 6 one by one, and after the top ends of the cooling and heating medium pipes 7 are inserted into the groove 502 of the cooling and heating medium guide plate 5, the crystallization pipes 6 are positioned in the corresponding cooling and heating medium pipes 7; the top end of the flow guiding hole 501 is provided with a round chamfer angle for flow guiding so that the cooling and heating media can be coated on the outer wall of the crystallization tube 6.

As shown in fig. 1, an upper clamp 12 and a lower clamp 13 for clamping the crystal tube 6, and an upper clamp 14 and a lower clamp 15 for clamping the heating and cooling medium tube 7 are further provided inside the housing 1, so that the crystal tube 6 is clamped and fixed by the upper clamp 12 and the lower clamp 13, and the heating and cooling medium tube 7 is clamped and fixed by the upper clamp 14 and the lower clamp 15. The upper clamping plate I12, the lower clamping plate I13, the upper clamping plate II 14 and the lower clamping plate II 15 are welded on the inner wall of the shell 1, and a sealed space is formed between the upper clamping plate I12 and the lower clamping plate I13, so that a cooling medium is prevented from entering the inner space of the shell 1 below the lower clamping plate I13.

A filter screen 16 for collecting crystals is disposed inside the casing 1, the filter screen 16 is a mesh structure with an upward opening, and in this embodiment, the filter screen 16 is adhered to the inner wall of the casing 1. Since the filter screen 16 has a mesh structure with an upward opening, when crystals in the crystallization tube 6 fall off, the fallen crystals fall on the filter screen 16, thereby preventing the crystals from entering the discharge tube 3 and blocking the discharge tube 3. Moreover, the embodiment can enable the materials and the crystals falling on the filter screen 16 to be gathered towards the middle part of the filter screen 16, so that the materials are discharged after the crystals are completely melted, and the product yield is ensured.

An air overflow port 17 for exhausting air is arranged at the top end of the shell 1, and two cooling and heating medium inlet and outlet pipes 18 for the cooling and heating medium to enter and exit from the interior of the shell 1 (the "interior of the shell 1" refers to a sealed space between the upper clamp plate 12 and the lower clamp plate 13) are communicated with the interior of the shell 1, wherein one cooling and heating medium inlet and outlet pipe 18 is positioned between the upper clamp plate 12 and the upper clamp plate 14, and the other cooling and heating medium inlet and outlet pipe 18 is positioned between the lower clamp plate 15 and the lower clamp plate 13. An overflow pipe 19 for overflowing the materials is further communicated with the interior of the shell 1, and the overflow pipe 19 is located above the upper clamping plate I12.

The specific implementation process is as follows:

the cooling and heating medium is input into the sealed space through the cooling and heating medium inlet and outlet pipe 18 positioned above, the cooling and heating medium flows on the cooling and heating medium guide plate 5, then the cooling and heating medium flows into the cooling and heating medium pipe 7 through the guide hole 501, and the top end of the guide hole 501 is provided with a round chamfer used for guiding, so that the cooling and heating medium forms a film on the outer wall of the crystallization pipe 6 under the guiding effect of the round chamfer, and the cooling and heating medium can absorb the heat of the flowing material on the inner walls of the crystallization pipe 6 and the crystallization pipe 6. The cooling and heating medium flows downwards along the outer wall of the crystallization pipe 6 under the action of gravity and finally flows out through the cooling and heating medium inlet and outlet pipe 18 positioned below, so that the crystallization of the material is realized. In addition, when the crystal needs to be melted, the cooling medium flows into the sealed space through the cooling medium inlet and outlet pipe 18 positioned at the lower part, and after the heat is released, the cooling medium is separated through the cooling medium inlet and outlet pipe 18 positioned at the upper part, so that the crystal is melted.

The material enters the material branch pipe 410 through the feeding pipe 2 and flows along the inner walls of the material branch pipe 410 and the arc-shaped pipe 430, finally flows to the inner wall of the liquid separation head 420, the initial rotational flow is formed by guiding the flow of the spiral guide groove II 421 on the inner wall of the liquid separation head 420, the material forming the initial rotational flow flows into the rotational flow part 810 of the rotational flow film distribution head 8 under the action of gravity and flows along the inner wall of the rotational flow part 810, and therefore, under the guiding action of the spiral guide groove I811 on the inner wall of the rotational flow part 810, the material forms a secondary rotational flow and has a circumferential initial speed. The material that forms the secondary whirl flows to crystallization pipe 6 inner wall along the inner wall of straight tube portion 820 to film on crystallization pipe 6 inner wall, because the material has circumference initial velocity, consequently, can slow down the radial gathering situation of material, make the material evenly form a film on crystallization pipe 6 inner wall, thereby make the crystallization more even, improve the homogeneity of crystal thickness, the crystallization on the crystallization pipe 6 inner wall is difficult for dropping, reduces the energy consumption.

And, in the process that the material forms the secondary whirl, the air in the crystallization tube 6 discharges to whirl portion 810 through trachea 10, air vent 101, and because the evacuation passageway 9 is left between whirl portion 810 and liquid separation head 420, therefore, the air discharges whirl portion 810 through evacuation passageway 9 and finally discharges casing 1 through the gas overflow mouth 17 on casing 1 top, so, the material forms the in-process of anticlockwise whirl and can not receive the influence of atmospheric pressure, be more favorable to the material to form the secondary whirl, make the material have higher circumference initial velocity, thereby form the membrane on crystallization tube 6 inner wall more evenly, and then further improve the homogeneity of crystal thickness, reduce the energy consumption, shorten crystallization time, improve crystallization efficiency.

The material flows downwards along the inner wall of the crystallization tube 6 to form a film under the action of gravity, finally flows out from the bottom end of the crystallization tube 6 and flows away through the discharge tube 3 at the bottom of the shell 1, and then enters the next procedure or is crystallized again.

After the crystallization is finished, the cooling and heating medium flows into the sealed space through the cooling and heating medium inlet and outlet pipe 18 positioned below the sealed space to heat the crystallization on the inner wall of the crystallization pipe 6, at the moment, the temperature of the cooling and heating medium is slightly lower than the melting point of the crystallization, and then the crystallization begins to sweat, so that the purity of the crystallization is improved. After the sweating process is finished, the temperature of the cooling and heating medium is increased, so that the temperature of the cooling and heating medium is increased to the melting point of the crystal, the crystal starts to melt (a molten product is obtained), and the crystal flows downwards along the crystallization pipe 6 and finally flows out through the discharge pipe, and the product is obtained.

In the crystallization process or the sweating process, crystals intercepted on the filter screen 16 and falling off from the inner wall of the crystallization pipe 6 are gathered to the middle part of the filter screen 16, and in the crystallization and melting process, molten products after being molten are heated and melted and flow out along with the products through the discharge pipe, so that the product yield is ensured, and the continuous production of equipment is facilitated.

To sum up, this embodiment can make the material flow in the crystallization pipe 6 with the mode of whirl, and because the air in the crystallization pipe 6 can smoothly discharge the crystallization pipe 6, consequently the material has higher circumference initial velocity, can effectively slow down the radial gathering situation of material, thereby make the material form a film on 6 inner walls of crystallization pipe more evenly, the heat transfer effect is better, more even, and then make the thickness of crystallization on 6 inner walls of crystallization pipe more even, effectively reduce the difference of 6 upper portions of crystallization pipe and the 6 lower parts thickness of crystallization pipe, the crystallization is difficult for droing. Even if the crystals fall off, the crystals can be intercepted and collected by the filter screen 16, so that the discharge pipe 3 cannot be blocked, and continuous production of equipment can be realized. And, the velocity of flow of material is faster than the velocity of flow of material in the natural film forming in this embodiment, and crystallization efficiency is higher, has reduced the energy consumption.

Example two

The present embodiment is different from the first embodiment only in that: as shown in fig. 12, in the present embodiment, the inner diameter of the bottom of the straight tube portion 820 is gradually increased from top to bottom, that is, the longitudinal section of the inner wall of the bottom of the straight tube portion 820 is splayed. In this embodiment, the inner diameter of the bottom of the straight tube portion 820 is gradually increased from top to bottom, and compared with the first embodiment, after the material forms the secondary rotational flow, the material can be stably transited to the inner wall of the crystallization tube 6 along the inner wall of the straight tube portion 820, so that the impact force of the material on the inner wall of the crystallization tube 6 when the material enters the crystallization tube 6 from the straight tube portion 820 is reduced, and the rotational flow effect is better kept on the inner wall of the crystallization tube 6.

EXAMPLE III

The present embodiment is different from the first embodiment only in that: as shown in fig. 13, in the present embodiment, the bottom end of the liquid separation head 420 is located in the swirling portion 810, so as to prevent the material from splashing out of the swirling film distribution head 8.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (10)

1. A continuous type whirl falling film melting crystallizer, includes material distribution pipe network and a plurality of crystallization pipe, its characterized in that: the material distribution pipe network comprises a plurality of liquid distribution heads, the top of the crystallization pipe is communicated with a rotational flow film distribution head, the inner wall of the rotational flow film distribution head is provided with a first spiral flow guide groove, the rotational flow film distribution heads are in one-to-one correspondence with the liquid distribution heads, and an emptying channel is reserved between the rotational flow film distribution heads and the corresponding liquid distribution heads.

2. A continuous swirl falling film melt crystallizer as claimed in claim 1, wherein: the cyclone film distribution head is internally provided with a vent pipe, the top end of the vent pipe is provided with a flow guide table, and the side wall of the vent pipe is provided with a plurality of vent holes.

3. A continuous swirl falling film melt crystallizer as claimed in claim 2, wherein: the inner wall of the rotational flow film distribution head is provided with a plurality of first spiral flow guide strips, a first spiral flow guide groove is formed between every two adjacent first spiral flow guide strips, and the bottom end of the vent pipe is connected with the first spiral flow guide strips.

4. A continuous-type swirl-flow falling film melt crystallizer as claimed in claim 2 or 3, wherein: the top surface of water conservancy diversion platform is the sphere form, and the convex surface of water conservancy diversion platform is towards dividing the liquid head.

5. A continuous swirl falling film melt crystallizer as claimed in claim 1, wherein: and a second spiral diversion trench is formed in the inner wall of the liquid separation head.

6. A continuous swirl falling film melt crystallizer as claimed in claim 5, wherein: the bottom end of the liquid separation head is positioned in the swirling flow membrane distribution head.

7. A continuous swirl falling film melt crystallizer as claimed in claim 4, wherein: the cyclone film distributing head comprises a cyclone part and a straight pipe part, the first spiral guide groove is formed in the inner wall of the cyclone part, and the inner diameter of the vent pipe is 1/3-1/2 of the inner diameter of the straight pipe part.

8. A continuous swirl falling film melt crystallizer as claimed in claim 7, wherein: the diversion table is located 1/3 ~ 1/2 of whirl portion height, and the diameter that the diversion table is close to breather pipe one end is greater than the external diameter of breather pipe.

9. A continuous swirl falling film melt crystallizer as claimed in claim 1, wherein: the crystallizer still includes cold heat medium guide plate and a plurality of cold heat medium pipe, seted up a plurality of confessions on the cold heat medium guide plate set up on the water conservancy diversion hole cold heat medium guide plate that the crystallization pipe runs through and supply cold heat medium pipe male recess, the one end that the recess was kept away from in the water conservancy diversion hole is equipped with the round chamfer that is used for the water conservancy diversion.

10. A continuous swirl falling film melt crystallizer as claimed in claim 1, wherein: a filter screen for collecting crystals is arranged below the crystallization tube.

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