CN116036642A

CN116036642A - Continuous scraper crystallizer with single water cooling passage

Info

Publication number: CN116036642A
Application number: CN202211621137.XA
Authority: CN
Inventors: 张其忠; 郭蔡乐; 杨品; 张贵; 韩辉; 鲁学锐
Original assignee: Anhui Haihua Technology Group Co ltd
Current assignee: Anhui Haihua Technology Group Co ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-05-02

Abstract

The invention relates to the technical field of crystallizers, and discloses a continuous scraper crystallizer with a single water cooling passage, which comprises a crystallizer shell, wherein a plurality of cooling plates are fixed in the crystallizer shell, cooling water circulation channels are arranged in the cooling plates, and adjacent cooling plates are connected in series through communicating pipes; an air cooling box is arranged at the top end of the crystallizer shell, and the top end part of the communicating pipe extends into the air cooling box; and a stirring shaft is rotatably arranged in the crystallizer shell, the stirring shaft is driven by a rotating motor, and a stirring scraping crystallization mechanism is arranged at the position, corresponding to the cooling plate, of the outer part of the stirring shaft. The invention has the advantages that only one path of cooling water is used, the temperature gradient is uniform, the crystallization effect is good, the purity and the yield of the product can be provided, the inner wall of the shell of the crystallizer is strictly polished, the roughness is less than or equal to 0.1nm, the phenomenon of wall formation is basically avoided, and the production is smoother.

Description

Continuous scraper crystallizer with single water cooling passage

Technical Field

The invention relates to the technical field of crystallizers, in particular to a continuous scraper crystallizer with a single water cooling passage.

Background

The crystallizer is mainly used for crystallization operation, and the container wall is provided with a jacket or a coil pipe which is arranged in the crystallizer and is used for heating or cooling the solution in the tank. The types of the crystallizer are many, and the method for obtaining the supersaturation state according to the solution can be divided into an evaporation crystallizer and a cooling crystallizer, and a mother liquor circulation crystallizer and a crystal slurry (i.e., a mixture of mother liquor and crystals) circulation crystallizer can be divided into a flow mode, and a continuous crystallizer and a batch crystallizer can be divided into an operation mode.

Crystallization is an important chemical process, one of the main means of purifying substances, and many chemical, pharmaceutical and intermediate products are in crystal form, and crystallization is often the best and most economical method for mass production of the chemical, pharmaceutical and intermediate products, and crystallization is realized by a crystallizer. Therefore, the arrangement of the crystallization equipment with reasonable structure is particularly important for preparing chemical products needing crystallization.

The cooling plate type crystallizer in the prior art is mainly used for cooling hot melt materials in a cooling plate flowing way, so that the hot melt materials are crystallized, and the crystallizer in the prior art has the following problems:

1. in the crystallizer in the prior art, the cooling plates are distributed in the cooling container at equal intervals, every three cooling plates share one water path, the smoothness of the inner wall of the cooling container is insufficient, the temperature gradient of materials in the cooling container is uneven, the crystallization effect is deviated, serious crystallization wall-forming phenomenon can occur, and the crystallization is difficult to clean.

2. In the crystallizer in the prior art, cooling water flows through the cooling plate in the process, and when in the rear section, the temperature of the cooling water is rapidly increased due to the heat exchange effect, so that the cooling effect of the rear section on materials is concentrated and reduced, the temperature difference of the materials in the crystallizer is large, and the problems of uneven crystal grains and slower overall crystallization speed are caused.

3. In the prior art, when crystals on the surface of a cooling plate are scraped by a scraper, crystals are accumulated on the surface of the scraper, so that the scraping crystallization efficiency of the scraper is affected.

Disclosure of Invention

The invention provides a continuous scraper crystallizer with a single water cooling passage, which solves the problems in the background technology.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the continuous scraper crystallizer with a single water cooling passage comprises a crystallizer shell, wherein a plurality of cooling plates are fixed in the crystallizer shell, cooling water circulation channels are arranged in the cooling plates, adjacent cooling plates are connected in series through communicating pipes, cooling water sequentially passes through the cooling plates through the communicating pipes, and heat exchange is carried out between the cooling water and a hot melting material through the cooling plates, so that cooling crystallization is realized, and as only one path of cooling water, the temperature gradient is uniform, the crystallization effect is good, the purity and the yield of a product can be provided, the inner wall of the crystallizer shell is strictly polished, the roughness is ensured to be less than or equal to 0.1nm, the phenomenon of wall formation is basically avoided, and the production is smoother;

the top end of the crystallizer shell is provided with an air cooling box, the top end part of the communicating pipe extends into the air cooling box, and the air cooling box can perform air cooling on cooling water in the communicating pipe in an air cooling mode, so that the temperature of the cooling water is reduced, and the crystallization effect is better;

the mixer shaft is installed in the crystallizer shell internal rotation, and the mixer shaft passes through rotating electrical machines drive, and the stirring is scraped crystallization mechanism is installed to the outside of mixer shaft and cooling plate corresponding position to rotating electrical machines drive mixer shaft rotates to drive stirring and strike off crystallization mechanism and rotate, can stir the material on the one hand, make the material temperature more even, on the other hand can strike off the crystallization that the cooling plate surface formed.

Preferably, both ends of the crystallizer shell are respectively connected with a hot-melting material inlet and a hot-melting material outlet, the bottom end of the cooling plate is provided with a material circulation channel, the hot-melting material can circulate in the material circulation channel and exchange heat with each cooling plate in sequence, and a baffling water channel is arranged in the cooling plate, so that the heat exchange efficiency between cooling water and the hot-melting material is improved.

Preferably, a section of the communicating pipe located in the air cooling box is sleeved with a heat conducting sleeve, heat radiating fins are arranged on the heat conducting sleeve, and preferably, the plurality of heat radiating fins are arranged and distributed in parallel at equal intervals on the heat conducting sleeve, low-temperature air is introduced into the air cooling box, and the heat exchange area between the low-temperature air and the heat radiating fins can be increased by additionally arranging the heat radiating fins, so that the cooling of cooling water in the communicating pipe is promoted.

Preferably, the air cooling box comprises an air cooling box body, a cold air discharging pipe and a hot air discharging pipe are arranged on the air cooling box body, a circulating pipe communicated with the hot air discharging pipe extends on the air cooling box body, and the cold air discharging pipe is communicated with the air cooler, so that air flow is formed in the air cooling box, the flow direction of the air flow is parallel to the radiating fins, and the cold air flow can exchange heat with the radiating fins, so that cooling water is cooled.

Preferably, the first electric air valve is installed on the hot air discharge pipe, the second electric air valve is installed on the circulating pipe, the temperature sensor is also installed on the hot air discharge pipe, the temperature of air discharged from the hot air discharge pipe can be monitored through the temperature sensor, when the temperature of the air discharged from the hot air discharge pipe is lower, cold air can be repeatedly used, the second electric air valve is opened at the moment to close the first electric air valve, so that the cold air can be circulated in the air cooling box through the circulating pipe again, and further, the recycling is more energy-saving, a fan for promoting the circulation flow of air flow is arranged in the circulating pipe, when the temperature of the air discharged from the hot air discharge pipe is higher, the second electric air valve is closed at the moment to open the first electric air valve, so that hot air is discharged from the hot air discharge pipe, and new low-temperature air is introduced through the cold air discharge pipe.

Preferably, a fan is arranged between the cold air discharging pipe and the air cooling box body, a fan rotating shaft of the fan is connected with a first belt pulley, the flow speed of air flow in the air cooling box can be improved through the fan, and the air cooling heat exchange effect is improved.

Preferably, one end of the stirring shaft extends to the outside of the crystallizer shell and is fixedly provided with a second belt pulley, the first belt pulley and the second belt pulley are in belt transmission, the diameter of the first belt pulley is smaller than that of the second belt pulley, and when the rotating motor drives the stirring shaft to rotate, the fan can be driven to operate through belt transmission.

Preferably, the stirring scraping crystallization mechanism comprises two first crystallization scraping plates symmetrically arranged on two sides of the cooling plate, the first crystallization scraping plates are fixedly connected with the stirring shaft, and when the stirring shaft drives the first crystallization scraping plates to rotate relative to the cooling plate, one side of each first crystallization scraping plate is in contact with the surface of the cooling plate, so that crystals formed on the surface of the cooling plate can be scraped.

Preferably, the stirrer is installed to one side that the cooling plate was kept away from to a preferred first crystallization scraper blade, is equipped with a plurality of through-holes on the stirrer, and the stirrer can rotate along with the (mixing) shaft and stir the molten material, and the through-hole of stirrer can improve the stirring effect of stirrer.

Preferably, a lifting driving box is arranged between the first crystallization scraper and the stirrer, the output end of the lifting driving box is connected with a second crystallization scraper, the second crystallization scraper is in contact with the first crystallization scraper, and the second crystallization scraper can move up and down, so that crystals accumulated on the surface of the first crystallization scraper are scraped, and the crystallization scraping effect of the first crystallization scraper is improved.

Preferably, the lifting drive box is rotationally provided with the reciprocating screw rod, the outer side thread of the reciprocating screw rod is provided with the lifting sleeve, the lifting sleeve is connected with the cross rod, the cross rod extends to the outside of the lifting drive box through the vertical guide opening and is fixed with the second crystallization scraper, one end of the reciprocating screw rod extends to the outside of the lifting drive box and is fixed with the first gear, the second gear is fixed with the second gear in the rotating shaft of the stirrer and is meshed with the first gear, the two sides of the cooling plate are respectively fixed with the toothed ring, the toothed rings are meshed with the first gear, when the stirring scraping crystallization mechanism rotates along with the stirring shaft, the first gear walks on the toothed rings, so that the reciprocating screw rod can be driven to rotate, and then the lifting sleeve can be driven to move up and down, thereby driving the second crystallization scraper to scrape crystals accumulated on the surface of the first crystallization scraper, and the crystallization scraping effect of the first crystallization scraper is improved.

The beneficial effects of the invention are as follows:

1. the cooling water is only used for one path, the temperature gradient is uniform, the crystallization effect is good, the purity and the yield of the product can be provided, the inner wall of the shell of the crystallizer is strictly polished, the roughness is less than or equal to 0.1nm, the phenomenon of wall formation is basically avoided, and the production is smoother;

2. by additionally arranging the air cooling box, the air cooling box can perform air cooling on cooling water in the communicating pipe in an air cooling mode, so that the temperature of the cooling water is reduced, the crystallization effect is better, the temperature difference of materials in the crystallizer is reduced, and the crystallization particles are more uniform;

3. through stirring and strike off crystallization mechanism's design, when stirring strike off crystallization mechanism rotates along with the (mixing) shaft, first gear walks on the ring gear to can drive reciprocating screw and rotate, and then can drive lift sleeve lift and remove, thereby drive the second crystallization scraper blade and reciprocate, thereby strike off the crystallization of first crystallization scraper blade surface accumulation, thereby improve the crystallization effect of striking off of first crystallization scraper blade.

Drawings

Fig. 1 is a main view cross-section of a continuous drag mold with a single water cooling passage according to the present invention.

Fig. 2 is a top view of a continuous scraped surface crystallizer with a single water cooling channel according to the invention.

FIG. 3 is a broken view of a continuous scraped surface crystallizer with a single water cooling channel according to the invention.

Fig. 4 is an enlarged schematic view of a stirring scraping crystallization mechanism of a continuous scraper crystallizer with a single water cooling passage according to the present invention.

Fig. 5 is an enlarged perspective view of a stirring scraping crystallization mechanism of a continuous scraper crystallizer with a single water cooling passage according to the present invention.

Fig. 6 is a sectional view of a lifting drive box of a stirring and scraping crystallization mechanism of a continuous scraper crystallizer with a single water cooling passage.

Fig. 7 is a cross-sectional view of a cooling plate of a continuous drag mold with a single water cooling passage according to the present invention.

FIG. 8 is a schematic diagram showing a series connection between adjacent cooling plates of a continuous scraped surface crystallizer with a single water cooling passage according to the invention.

Fig. 9 is a diagram showing a connection relationship between a heat sink fin and a communication tube of a continuous scraped surface crystallizer with a single water cooling channel according to the present invention.

Reference numerals in the drawings: 1. a crystallizer shell; 101. a hot melt material inlet; 102. a hot melt material outlet; 2. a stirring shaft; 201. a rotating electric machine; 202. a second pulley; 3. a cooling plate; 301. a material flow channel; 302. a communicating pipe; 303. a heat conducting sleeve; 304. a heat radiation fin; 305. a toothed ring; 4. stirring, scraping and crystallizing mechanism; 401. a first crystallization blade; 402. a lifting driving box; 4021. a reciprocating screw rod; 4022. lifting the sleeve; 4023. a cross bar; 4024. a second crystallization blade; 4025. a first gear; 403. a stirrer; 4031. a second gear; 5. an air-cooled box body; 501. a cold air discharge pipe; 502. a hot air discharge pipe; 5021. a first electric air valve; 5022. a temperature sensor; 503. a circulation pipe; 5031. a second electric air valve; 6. a blower; 601. a first pulley.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.

Referring to fig. 1-9, a continuous scraper crystallizer with a single water cooling passage comprises a crystallizer shell 1, wherein a plurality of cooling plates 3 are fixed in the crystallizer shell 1, cooling water circulation channels are arranged in the cooling plates 3, the adjacent cooling plates 3 are connected in series through communicating pipes 302, the communicating pipes 302 can be of a U-shaped structure, cooling water sequentially passes through the cooling plates 3 through the communicating pipes 302, and heat exchange is carried out between the cooling water and hot melting materials through the cooling plates 3, so that cooling crystallization is realized, and as only one path of cooling water, the temperature gradient is uniform, the crystallization effect is good, the purity and the yield of products can be provided, the inner wall of the crystallizer shell 1 is strictly polished, the roughness is less than or equal to 0.1nm, the phenomenon of wall formation is basically avoided, and the production is smoother;

the top end of the crystallizer shell 1 is provided with an air cooling box, the top end part of the communicating pipe 302 extends into the air cooling box, and the air cooling box can perform air cooling on cooling water in the communicating pipe 302 in an air cooling mode, so that the temperature of the cooling water is reduced, and the crystallization effect is better;

the (mixing) shaft 2 is installed to crystallizer shell 1 internal rotation, and (mixing) shaft 2 passes through rotating electrical machines 201 drive, and stirring striking off crystallization mechanism 4 is installed to the outside of (mixing) shaft 2 and cooling plate 3 corresponding position to rotating electrical machines 201 drive (mixing) shaft 2 rotates to drive stirring striking off crystallization mechanism 4 and rotate, can stir the material on the one hand, make the material temperature more even, on the other hand can strike off the crystallization that cooling plate 3 surface formed.

Wherein, the both ends of crystallizer shell 1 are connected with hot melt material import 101 and hot melt material export 102 respectively, and material circulation passageway 301 has been seted up to cooling plate 3 bottom, and hot melt material can circulate in material circulation passageway 301 to carry out heat exchange with each cooling plate 3 in proper order, the inside of cooling plate 3 is equipped with the baffling water course, improves the heat exchange efficiency between cooling water and the hot melt material.

Wherein, a section outside cover that communicating pipe 302 is located the air-cooled box is equipped with heat conduction cover 303, is equipped with heat radiation fin 304 on the heat conduction cover 303, and heat radiation fin 304 is equipped with a plurality ofly, and parallel equidistance distributes on heat conduction cover 303, lets in low temperature air in the air-cooled box, through addding heat radiation fin 304 can improve the heat transfer area between low temperature air and the heat radiation fin 304 to promote the cooling of communicating pipe 302 inside cooling water.

The air cooling box comprises an air cooling box body 5, a cold air discharging pipe 501 and a hot air discharging pipe 502 are arranged on the air cooling box body 5, a circulating pipe 503 communicated with the hot air discharging pipe 502 extends on the air cooling box body, the cold air discharging pipe 501 is communicated with an air cooler, so that air flow is formed in the air cooling box, the flow direction of the air flow is parallel to the radiating fins 304, and the cold air flow can exchange heat with the radiating fins 304, so that cooling water is cooled.

Wherein, install first electric air valve 5021 on the hot-blast discharge pipe 502, install second electric air valve 5031 on the circulating pipe 503, still install temperature sensor 5022 on the hot-blast discharge pipe 502, can monitor the temperature of the air of discharging on the hot-blast discharge pipe 502 through temperature sensor 5022, when the temperature of hot-blast discharge pipe 502 discharge is lower, can carry out the reuse to the air conditioning, open second electric air valve 5031 this moment and close first electric air valve 5021 for the air conditioning can circulate in the air-cooling box again through circulating pipe 503, thereby reuse, more energy-conserving, be equipped with the fan that promotes the air current circulation flow in the circulating pipe 503, when the temperature of hot-blast discharge pipe 502 discharge is higher, close second electric air valve 5031 at this moment and open first electric air valve 5021, make hot air discharge from hot-blast discharge pipe 502, and introduce new low temperature air through cold wind discharge pipe 501.

Wherein, install fan 6 between cold wind row's of tubes 501 and the air-cooled case, can improve the velocity of flow of air current in the air-cooled case through the fan, improve the effect of forced air cooling heat transfer.

Wherein, be connected with first belt pulley 601 in the fan pivot of fan 6, the one end of (mixing) shaft 2 extends to the outside of crystallizer shell 1 and is fixed with second belt pulley 202, pass through belt drive between first belt pulley 601 and the second belt pulley 202, and the diameter of first belt pulley 601 is less than the diameter of second belt pulley 202, when rotating electrical machines 201 drove (mixing) shaft 2 and rotate, can drive fan 6 through belt drive and move, because the diameter of first belt pulley 601 is less than second belt pulley 202 for fan 6 can move with relative higher rotational speed.

Wherein, stirring striking off crystallization mechanism 4 includes two symmetry sets up the first crystallization scraper blade 401 in cooling plate 3 both sides, and first crystallization scraper blade 401 and (mixing) shaft 2 fixed connection, and when (mixing) shaft 2 drove first crystallization scraper blade 401 for cooling plate 3 rotation, because first crystallization scraper blade 401 one side and cooling plate 3 surface contact to can strike off the crystallization that cooling plate 3 surface formed.

Wherein, one of them first crystallization scraper blade 401 is kept away from one side of cooling plate 3 and is installed agitator 403, is equipped with a plurality of through-holes on the agitator 403, and agitator 403 can rotate along with (mixing) shaft 2 and stir the molten material, and the through-hole of agitator 403 can improve the stirring effect of agitator 403.

Wherein, be equipped with lift drive case 402 between first crystallization scraper 401 and the agitator 403, the output of lift drive case 402 is connected with second crystallization scraper 4024, and second crystallization scraper 4024 contacts with first crystallization scraper 401, and second crystallization scraper 4024 can reciprocate to strike off the crystallization of first crystallization scraper 401 surface accumulation, thereby improve the crystallization of first crystallization scraper 401 and strike off the effect.

Wherein, reciprocating screw rod 4021 is installed to the rotation of lift drive case 402, lifting sleeve 4022 is installed to the outside screw thread of reciprocating screw rod 4021, be connected with horizontal pole 4023 on the lifting sleeve 4022, horizontal pole 4023 extends to lift drive case 402 outside through vertical guiding mouth, and be fixed with second crystallization scraper 4024, reciprocating screw rod 4021's one end extends to lift drive case 402 outside and is fixed with first gear 4025, agitator 403 is connected with first crystallization scraper 401 rotation, be fixed with second gear 4031 in the pivot of agitator 403, second gear 4031 meshes with first gear 4025, both sides of cooling plate 3 are all fixed with ring gear 305, ring gear 305 meshes with first gear 4025, when stirring striking-off crystallization mechanism 4 rotates along with stirring axle 2, first gear 4025 walks on ring gear 305, thereby can drive reciprocating screw rod 4021 and then drive lifting sleeve 4022 and go up and down to remove, thereby strike-off the crystallization of first crystallization scraper 401 surface accumulation, thereby improve crystallization scraper 401 and the effect of second gear 4031 can also mesh with first gear 4025 simultaneously because of rotating with first gear 4022.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims

1. The continuous scraper crystallizer with the single water cooling passage comprises a crystallizer shell (1), and is characterized in that a plurality of cooling plates (3) are fixed in the crystallizer shell (1), cooling water circulation channels are arranged in the cooling plates (3), and adjacent cooling plates (3) are connected in series through communicating pipes (302);

an air cooling box is arranged at the top end of the crystallizer shell (1), and the top end part of the communicating pipe (302) extends into the air cooling box;

a stirring shaft (2) driven by a rotary motor (201) is arranged in the crystallizer shell (1), and a stirring scraping crystallization mechanism (4) is arranged at the position, corresponding to the cooling plate (3), of the outer part of the stirring shaft (2).

2. The continuous scraper crystallizer with the single water cooling passage according to claim 1, wherein a heat conducting sleeve (303) is sleeved outside a section of the communicating pipe (302) positioned in the air cooling box, and heat radiating fins (304) are arranged on the heat conducting sleeve (303).

3. A continuous flight crystallizer with a single water cooling channel according to claim 1, characterized in that the air cooling box comprises an air cooling box body (5), a cold air discharging pipe (501) and a hot air discharging pipe (502) are arranged on the air cooling box body (5), and a circulating pipe (503) communicated with the hot air discharging pipe (502) extends on the air cooling box body.

4. A continuous scraper crystallizer with a single water cooling channel according to claim 3, characterized in that the hot air discharge pipe (502) is provided with a first electric air valve (5021), the circulating pipe (503) is provided with a second electric air valve (5031), and the hot air discharge pipe (502) is also provided with a temperature sensor (5022).

5. A continuous blade crystallizer with single water cooling channel according to claim 3, characterized in that a fan (6) is installed between the cold air discharge pipe (501) and the air cooling box (5).

6. The continuous scraper crystallizer with a single water cooling passage according to claim 5, wherein a first belt pulley (601) is connected to a fan rotating shaft of the fan (6), one end of the stirring shaft (2) extends to the outside of the crystallizer shell (1) and is fixed with a second belt pulley (202), and the first belt pulley (601) and the second belt pulley (202) are driven by a belt.

7. A continuous scraped surface crystallizer with single water cooling channel according to claim 1 characterized in that the stirring and scraping crystallization mechanism (4) comprises two first crystallization scrapers (401) symmetrically arranged on both sides of the cooling plate (3), the first crystallization scrapers (401) being connected with the stirring shaft (2).

8. A continuous strand scraper crystallizer with a single water cooling channel as claimed in claim 7, wherein one side of the first crystallization scraper (401) far from the cooling plate (3) is provided with a stirrer (403), and a plurality of through holes are arranged on the stirrer (403).

9. The continuous strand scraper crystallizer with a single water cooling channel as claimed in claim 8, wherein a lifting driving box (402) is arranged between the first crystallization scraper (401) and the stirrer (403), and the output end of the lifting driving box (402) is connected with a second crystallization scraper (4024) for scraping crystals on the surface of the first crystallization scraper (401).

10. The continuous scraper crystallizer with the single water cooling passage according to claim 1, wherein two ends of the crystallizer shell (1) are respectively connected with a hot melting material inlet (101) and a hot melting material outlet (102), a material circulation channel (301) is formed at the bottom end of the cooling plate (3), and the cooling water circulation channel is a baffling water channel.