CA1238265A - Apparatus for the production of granules from two- phase mixtures - Google Patents
Apparatus for the production of granules from two- phase mixturesInfo
- Publication number
- CA1238265A CA1238265A CA000439275A CA439275A CA1238265A CA 1238265 A CA1238265 A CA 1238265A CA 000439275 A CA000439275 A CA 000439275A CA 439275 A CA439275 A CA 439275A CA 1238265 A CA1238265 A CA 1238265A
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- Canada
- Prior art keywords
- droplet former
- crystallizer
- droplet
- feed line
- former
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
ABSTRACT OF THE DISCLOSURE
A device is described for the production of granules from two-phase mixtures. The initial product is enriched with crystal seeds in a pre-crystallizer whose temperature is controlled. The precrystallized mass is eventually fully crystallized on a cooling conveyor or the like.
According to the invention, a droplet former (2) follows the pre-crystallizer (1). The droplet former consists of two tubular bodies (2a,2b) placed against each other with their walls. The exterior body (2a) is provided with a plurality of orifices (2d). The inner body is provided only with a coaxial row of orifices (2c). The droplet former (2) is arranged above the cooling conveyor (3) so that the coaxial row of orifices (2c) faces the conveyor, the orifices (2c) being aligned with the orifices (2d) during the rotation of the outer tubular body (2a). The advance in the art is in that the invention avoids the need for additional grinding process and simplifies the process of formation of granules of an improved quality.
A device is described for the production of granules from two-phase mixtures. The initial product is enriched with crystal seeds in a pre-crystallizer whose temperature is controlled. The precrystallized mass is eventually fully crystallized on a cooling conveyor or the like.
According to the invention, a droplet former (2) follows the pre-crystallizer (1). The droplet former consists of two tubular bodies (2a,2b) placed against each other with their walls. The exterior body (2a) is provided with a plurality of orifices (2d). The inner body is provided only with a coaxial row of orifices (2c). The droplet former (2) is arranged above the cooling conveyor (3) so that the coaxial row of orifices (2c) faces the conveyor, the orifices (2c) being aligned with the orifices (2d) during the rotation of the outer tubular body (2a). The advance in the art is in that the invention avoids the need for additional grinding process and simplifies the process of formation of granules of an improved quality.
Description
I, 3 A arts for the reduction of anuses from two- hose Tracy PUP _ 12 go p he l~vention concern an apparatus for the production of granules from typhus inures earn the initial product is enriched with crystalline sly in temperature controlled precrystallizer and the precrystalliz~d welt subsequently crystallized on a cooling conveyor or the like.
In~tallati4ns of this type may be used for employ in the production of antioxidant, nickel catalysts, insecticide or morpholi~e ~iulfonEmide.
In toe prOCe6B the precrystalli~ed, untercooling melt ye placed directly sun a cooling conveyor end it crystallized thereon. The crystallized product is taken in the work of web or plates from the cooling conveyor and grunt into granules. It it a disadvantage that an additional process step is required after the crystallization end that in the grinding of the product no unit for grain size Jay be obtained. Furthermore, the dust component generated in the grinding proves it undesirable.
Suckled droplet former are known; they are used in the granulation of other products, which art dropped in the liquid form and then solidified on cooling conveyors to the granulate desired. In view of the relatively long retention time of the welt OR the reservoirs of the droplet former such lnst~llations cannot be used for the processing of the aforecited two-phase ~ixtures9 because deposition and incrustations (bridges Sue be formed, BY that the operation of the droplet former is no longer assured. Furthermore viscosity fluctuations in the medium, such us eye caused by nucleation of crystals, my lead Jo obstruction of the conveyor system, so in sty droplet I, "'"I
i2;3 8~5 former the droplet are formed by gravity. ~ndercool~ng welts with cry-Sal nuclei mixed into them are therefore shaped ant ground into greenly on the above described manner only.
It's the object of the present invention Jo provide an apparatus for the production of granule from tough mixtures of this eye, whereby the additional grinding process to eliminated nod in spite of this the pharaoh-lion of granules of excellent quality is obtained in a Lyle ranter.
he invention keynote of the fact that the precrystallizer it followed in lone by a droplet former cowering two tubular bodies placed against each other with their walls, one of said bodies brine equipped lath a plurality of pafi~age orifices d$6tributed over it circumference for the melt and the other only with a row of coccal orifices and that said droplet former 18 en-ringed over the cooling conveyor Jo that the row of coaxial passage orifices which during the relative rotation of the two tubular bodies it aligned aye-lically with the oriole of the other tubular body, facing the cooling con-voyeur. This oonf~ur~ti~n awoke it possible, to drop the melt very rapidly 60 what between the precrystallizer and the droplight already formed no large dead pus and long retention times are generated, which may lead to an us-desirable premature crystallization.
It 16 particularly advantageous that in this new apparatus far procure-telexed melts device for forced transportation to the droplet former may be provided end the droplet former may be connected by a doffed feed line with the precrystall~zer. The feeding of the product may therefore be effected independently of gra~lty Jo that higher capacltiea and throughput may be ox-twined, which in turn $6 the decisive factor whereby undercooking melt mixed , r . :, ~23~ I j lath crystal nuclei Jay be converted to a droplet form in on indus~rlally applicable manner at all. It it further advantage when a droplet former with an inner and an outer tube is used, that the fled line may have the same or approximately the sue dimmer as the inner tubular body of the droplet for-per and hay open axially unto said inner tube, BY that no appreciable changes take place on the flow velocity of the melt from the precry~tallizer to the droplet former. No dead spaces appear with respect to the flow end a co~stsnt flow rote may be assured, which 16 a prec~ndltion of droplet forming in the novel apparatus. It I an obvious further advantage thaw the entire system of the precry6tallizer, feed line end droplet former Day not only be maintained under presfiure, but also completely airtight BY that melts may be processed, which otherwise Gould undergo chemical conversion prowesses for example under the effect of oxygen, thereby affecting quality ~ieh respect to the dropping process and also in other relationships.
In the layout of the precrystallizer it it ad~antageou6 Jo equip it with a bypass sod a pump located therein and to branch the feed line to the droplet former off this beep circuit. It it then possible to determine I
quartile the volume to ye brought to the droplet former by jeans of a gear pump or another petering pump without affecting decisively end possibly dot- -mentally the recrystallization prows, for which the slow rate through the precrystallizer~ consisting for example of a tube equipped with baffle on the form of rotating blade end with a emperor controlled outer jacket, may be regulated as a function of the crystal nuclat~on de trod, wherein when the volume of the material flowing through the precrystallizer just be tub-ctanti~lly greater thin the volume supplied to the triplet former. This air-...
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culatlon is also required for the exact coordination of crystal nucleation with the dropping velocity. It has been found that a highly accurate ratio of crystal nuclei to the still liquid components in the mass to be dropped is important, as the high droplet form and the solidification of the droplets depend on it.
It has therefore been found to be highly advantageous to control on a precrystallizer with a water cooling jacket the temperature of the cooling medium as a function of the crystal content of the melt to be dropped. For this purpose a density measuring instrument may be set in the feed line from the precrystallizer to the droplet former to effect an exact regulation of the temperature of the cooling medium circulation. Alternatively, it is possible to scan the height of the ready crystallized droplet at the end of the conveyor, which is also dependent on the crystal content during the droplet forming process. It has been found that with increasing crystalline proportion the height of the particles dropped onto and solidifying on the cooling conveyor is rising, while in the case of slight crystal contents they become excessively flat and pancake like.
To affect the droplets formed subsequently to the droplet former on the conveyor it is further advantageous -- to the extent what mixtures of solids and the melt, for example dispersions with a high solids content are processed -- to provide a vibrator under the conveyor to act an the still plowable, newly formed droplets and to insure that the uppermost peak of in-dividual mass particles dropping onto the conveyor, which tends to solidify more rapidly and to remain as an undesirable tip on the final product likely to break off, sinks into the still hot remaini~g,mass, thereby providing , ., I, .,, I, , , -- ~2~2~;5 very beautiful hemispherical granule shapes.
The invention I illustrated by mean of an example of ~m~otlment in the drawing and explained in the description hereinbelow. In the drawings:
Figure 1 ooze B scbems~c$c top view of an apparatus according to the mention end Figure 2 a echoic lateral elevation of the area of the cooling con-voyeur with a rotor droplet wormer in a sectioned representation.
Fig. 1 show the fundamental layout of the apparatus according to the invention. The installation comprises a precrystallizer 1 to induce nuclear lion in us initial product 5, a droplet wormer 2 to form droplets from the recrystallized melt sod a cooling conveyor 3 to crystallize the droplet of the product.
The pr~crystalli~er 1 has 8 tube 8 and a bypass consisting of the conduit sections 7, pa and 7b end connected with the tuba 8. A pump 23 is arranged in the bypass whereby the melt to be recrystallized may be moved in circulation through the bypass 7 and the tube 8.
The liquid initial product 5 is supplied to the precrystallizer 1 from a reservoir 4 through & valve 6, the line 26 and a heat exchanger 24 and arrives in the tube 8. in which helical blades 9 are arranged on a rotating shaft aye driven by a motor M and supporting the introduction of nucleation.
The melt on which nucleation has been initiated during its transpor~atiQn through the tube B, awry in the conduit section 7b and is moved through a supply lone 11 opening into said section 7b, a gear pump 12 and a variable closing valve 13 to the droplet former 2. A certain measurable portion of the melt it pumped through the bypass section 7 by mean of the pump 23 and .
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. : :
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it mixed in the opening urea between the cond~lt oectl~ 73 sod the section 7 with the a yet uncrystallized initial product 5 and then Cain passes into the tube I
To control the precry6talli~ation product taking place, accurate tempo-nature regulation and the maintenance of optimum temperatures are necessary.
The conduit sectlGn6 I, I and 7b, together with the line 26 through which the initial product lo passing to the precry6tallizer I, therefore Keynote of double walled tubes connected with a heating installation 25, whereby for example water hunted by saturated team it circulate through the foremen-toned sections. The temperature in the different areas of the precry6tallizer end the line 26 ~onltored by several temperature measuring devices, I
shown for the sake of simplicity, so that by means of valves, again not shown, the hot Tory circulation may be controlled. The melt temperature ray be aft footed further for stabilization by means of the heat exchanger 24.
The tube 8, herein the precry6tallizat$on prows initiated, it surrounded by a cooling water jacket 10 connected lath a cooling water circus lotion K. nucleation take place a the result of cooling in the are of the tune 8. The individual conduit sections of the hot water circuit end the cool in jacket 10 art surrounded by the ~n6ulation 22, indicated only in the drawing Jo that better ctablliz~tion and constant maintenance of the tempera-Tory ore possible. The temperature of the cooling medium it regulated exactly in a manner explained in detail hereinafter.
The feed line 11~ through which the droplet former 2 it connected with the beep of the precrystslllzer 1 and in which the gear pump 12 and eye variable shutoff valve 13 are arranged, has the tame or nearly the same die-Peter I the inner tubular body 2b of the droplet former 2 teen in jig. 2 : , , _ 7 _ ~238Z~s and open wick the hove like section ha axially into the droplet former 2.
A the result of they'll short feed Lowe, through which the melt I moved under pressure, there it no appreciable change in the viscosity of the en from the precrystalli~er to the formation of the droplet. A cantata flow rate it as-urea by the acted pump, ~ndep~dently of the gravity effect. Altogether, the retention time of sh~pr~crystallized ~2lt in the feed lone to the dropping it relatively short a a result of these measures, 80 that no cry6talllza-lion of the melt take place on the process, that could feat deputy and clog-gong end could interfere with the uniform form ton of droplet.
The entire system of the precry6tallizer l, feed line 11 through the droplet former may be closed off in a completely airtight manner so that melts on which a flow of oxygen during the precry6talli~ation process would hove detrlmen~ fleet with respect to Sally Jay be proceed. In other words, the droplet former 2 is connected with the pre-crystallizer by a sealed feed line which, in the embodiment shown, includes the supply line 11, the pump 12, the valve 13 and the hose-like section ha.
The lnstallatlnn Jay be shut down by ennui of the clown valve 13 arranged it the feed line 11 end the melt still on the precry~t~llizer may ye pumped into a reservoir B.
As eye in Ply. 2, the droplet wormer 2 consists in a manner known in itself of an outer tube pa and an inner tube 2b. In the inner tube a coccal arranged row of passage orifices 2c it arranged, which are signed cyclically it the orifice Ed distributed over the circumference of the outer tube pa upon the rotation of the latter, which it driven by a rotor, not shown. In .
this manner, the precry6tallized melt it fed in droplets from top precrystal-leer 1, ~ndlcated only in Fig. l, onto the cooling conveyor. With the and of vibrator 16 the toll plowable, freshly formed droplet are acted upon, By that the peaks formed during the dropping are collapsing and product bluets 14 i - 8 - ~z3~26~
of a very beautiful granule shape. It is possible thereby to effect the format lion of droplets at a low temperature whereby the products are preserved and less energy is required in view of the shorter cooling time an the cooling conveyor 3. The proportion of dust in the product is also reduced. As the product is already recrystallized when dropped onto the cooling conveyor 3, it is sufficient to provide cooling by means of the refrigerating device 157 on the cooling conveyor 3 at a constant cooling temperature. Zone cooling, as required in the known installations, is not necessary with the apparatus of the invention.
As the crystal content during the dropping process is of decisive importance for the particle formation and for the execution of this type ox granulate production, a measuring instrument 30 is provided, which determines this crystal content, for example by means of density measurements, In the example of embodiment this measuring instrument is placed in the line 7b.
By means of the measuring instrument 30 the regulation of the temperature of the cooling medium circulation is effected in a manner not shown in detail.
It is further possible to control the volume of the cooling medium by acting on the valve 20 and to affect the temperature in the precrystallizer in this manner.
Alternatively, it is possible to detect the height h of the solidified droplet 14 at the end of the cooling conveyor 3, in place of the measuring instrument I as this also represents an indication of the crystal content of the droplets coming from the droplet former 2. The higher the crystal con-tent, the higher the granule droplets and vice versa. The height of the so-lidified droplets may be detected optically or by means of a mechanical scanner.
The temperature of the cooling circulation is regulated by these scanners.
,.~, ,".,, . I:
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In~tallati4ns of this type may be used for employ in the production of antioxidant, nickel catalysts, insecticide or morpholi~e ~iulfonEmide.
In toe prOCe6B the precrystalli~ed, untercooling melt ye placed directly sun a cooling conveyor end it crystallized thereon. The crystallized product is taken in the work of web or plates from the cooling conveyor and grunt into granules. It it a disadvantage that an additional process step is required after the crystallization end that in the grinding of the product no unit for grain size Jay be obtained. Furthermore, the dust component generated in the grinding proves it undesirable.
Suckled droplet former are known; they are used in the granulation of other products, which art dropped in the liquid form and then solidified on cooling conveyors to the granulate desired. In view of the relatively long retention time of the welt OR the reservoirs of the droplet former such lnst~llations cannot be used for the processing of the aforecited two-phase ~ixtures9 because deposition and incrustations (bridges Sue be formed, BY that the operation of the droplet former is no longer assured. Furthermore viscosity fluctuations in the medium, such us eye caused by nucleation of crystals, my lead Jo obstruction of the conveyor system, so in sty droplet I, "'"I
i2;3 8~5 former the droplet are formed by gravity. ~ndercool~ng welts with cry-Sal nuclei mixed into them are therefore shaped ant ground into greenly on the above described manner only.
It's the object of the present invention Jo provide an apparatus for the production of granule from tough mixtures of this eye, whereby the additional grinding process to eliminated nod in spite of this the pharaoh-lion of granules of excellent quality is obtained in a Lyle ranter.
he invention keynote of the fact that the precrystallizer it followed in lone by a droplet former cowering two tubular bodies placed against each other with their walls, one of said bodies brine equipped lath a plurality of pafi~age orifices d$6tributed over it circumference for the melt and the other only with a row of coccal orifices and that said droplet former 18 en-ringed over the cooling conveyor Jo that the row of coaxial passage orifices which during the relative rotation of the two tubular bodies it aligned aye-lically with the oriole of the other tubular body, facing the cooling con-voyeur. This oonf~ur~ti~n awoke it possible, to drop the melt very rapidly 60 what between the precrystallizer and the droplight already formed no large dead pus and long retention times are generated, which may lead to an us-desirable premature crystallization.
It 16 particularly advantageous that in this new apparatus far procure-telexed melts device for forced transportation to the droplet former may be provided end the droplet former may be connected by a doffed feed line with the precrystall~zer. The feeding of the product may therefore be effected independently of gra~lty Jo that higher capacltiea and throughput may be ox-twined, which in turn $6 the decisive factor whereby undercooking melt mixed , r . :, ~23~ I j lath crystal nuclei Jay be converted to a droplet form in on indus~rlally applicable manner at all. It it further advantage when a droplet former with an inner and an outer tube is used, that the fled line may have the same or approximately the sue dimmer as the inner tubular body of the droplet for-per and hay open axially unto said inner tube, BY that no appreciable changes take place on the flow velocity of the melt from the precry~tallizer to the droplet former. No dead spaces appear with respect to the flow end a co~stsnt flow rote may be assured, which 16 a prec~ndltion of droplet forming in the novel apparatus. It I an obvious further advantage thaw the entire system of the precry6tallizer, feed line end droplet former Day not only be maintained under presfiure, but also completely airtight BY that melts may be processed, which otherwise Gould undergo chemical conversion prowesses for example under the effect of oxygen, thereby affecting quality ~ieh respect to the dropping process and also in other relationships.
In the layout of the precrystallizer it it ad~antageou6 Jo equip it with a bypass sod a pump located therein and to branch the feed line to the droplet former off this beep circuit. It it then possible to determine I
quartile the volume to ye brought to the droplet former by jeans of a gear pump or another petering pump without affecting decisively end possibly dot- -mentally the recrystallization prows, for which the slow rate through the precrystallizer~ consisting for example of a tube equipped with baffle on the form of rotating blade end with a emperor controlled outer jacket, may be regulated as a function of the crystal nuclat~on de trod, wherein when the volume of the material flowing through the precrystallizer just be tub-ctanti~lly greater thin the volume supplied to the triplet former. This air-...
:- :
:
4 ~23~2~
culatlon is also required for the exact coordination of crystal nucleation with the dropping velocity. It has been found that a highly accurate ratio of crystal nuclei to the still liquid components in the mass to be dropped is important, as the high droplet form and the solidification of the droplets depend on it.
It has therefore been found to be highly advantageous to control on a precrystallizer with a water cooling jacket the temperature of the cooling medium as a function of the crystal content of the melt to be dropped. For this purpose a density measuring instrument may be set in the feed line from the precrystallizer to the droplet former to effect an exact regulation of the temperature of the cooling medium circulation. Alternatively, it is possible to scan the height of the ready crystallized droplet at the end of the conveyor, which is also dependent on the crystal content during the droplet forming process. It has been found that with increasing crystalline proportion the height of the particles dropped onto and solidifying on the cooling conveyor is rising, while in the case of slight crystal contents they become excessively flat and pancake like.
To affect the droplets formed subsequently to the droplet former on the conveyor it is further advantageous -- to the extent what mixtures of solids and the melt, for example dispersions with a high solids content are processed -- to provide a vibrator under the conveyor to act an the still plowable, newly formed droplets and to insure that the uppermost peak of in-dividual mass particles dropping onto the conveyor, which tends to solidify more rapidly and to remain as an undesirable tip on the final product likely to break off, sinks into the still hot remaini~g,mass, thereby providing , ., I, .,, I, , , -- ~2~2~;5 very beautiful hemispherical granule shapes.
The invention I illustrated by mean of an example of ~m~otlment in the drawing and explained in the description hereinbelow. In the drawings:
Figure 1 ooze B scbems~c$c top view of an apparatus according to the mention end Figure 2 a echoic lateral elevation of the area of the cooling con-voyeur with a rotor droplet wormer in a sectioned representation.
Fig. 1 show the fundamental layout of the apparatus according to the invention. The installation comprises a precrystallizer 1 to induce nuclear lion in us initial product 5, a droplet wormer 2 to form droplets from the recrystallized melt sod a cooling conveyor 3 to crystallize the droplet of the product.
The pr~crystalli~er 1 has 8 tube 8 and a bypass consisting of the conduit sections 7, pa and 7b end connected with the tuba 8. A pump 23 is arranged in the bypass whereby the melt to be recrystallized may be moved in circulation through the bypass 7 and the tube 8.
The liquid initial product 5 is supplied to the precrystallizer 1 from a reservoir 4 through & valve 6, the line 26 and a heat exchanger 24 and arrives in the tube 8. in which helical blades 9 are arranged on a rotating shaft aye driven by a motor M and supporting the introduction of nucleation.
The melt on which nucleation has been initiated during its transpor~atiQn through the tube B, awry in the conduit section 7b and is moved through a supply lone 11 opening into said section 7b, a gear pump 12 and a variable closing valve 13 to the droplet former 2. A certain measurable portion of the melt it pumped through the bypass section 7 by mean of the pump 23 and .
.
. : :
-3~2~
it mixed in the opening urea between the cond~lt oectl~ 73 sod the section 7 with the a yet uncrystallized initial product 5 and then Cain passes into the tube I
To control the precry6talli~ation product taking place, accurate tempo-nature regulation and the maintenance of optimum temperatures are necessary.
The conduit sectlGn6 I, I and 7b, together with the line 26 through which the initial product lo passing to the precry6tallizer I, therefore Keynote of double walled tubes connected with a heating installation 25, whereby for example water hunted by saturated team it circulate through the foremen-toned sections. The temperature in the different areas of the precry6tallizer end the line 26 ~onltored by several temperature measuring devices, I
shown for the sake of simplicity, so that by means of valves, again not shown, the hot Tory circulation may be controlled. The melt temperature ray be aft footed further for stabilization by means of the heat exchanger 24.
The tube 8, herein the precry6tallizat$on prows initiated, it surrounded by a cooling water jacket 10 connected lath a cooling water circus lotion K. nucleation take place a the result of cooling in the are of the tune 8. The individual conduit sections of the hot water circuit end the cool in jacket 10 art surrounded by the ~n6ulation 22, indicated only in the drawing Jo that better ctablliz~tion and constant maintenance of the tempera-Tory ore possible. The temperature of the cooling medium it regulated exactly in a manner explained in detail hereinafter.
The feed line 11~ through which the droplet former 2 it connected with the beep of the precrystslllzer 1 and in which the gear pump 12 and eye variable shutoff valve 13 are arranged, has the tame or nearly the same die-Peter I the inner tubular body 2b of the droplet former 2 teen in jig. 2 : , , _ 7 _ ~238Z~s and open wick the hove like section ha axially into the droplet former 2.
A the result of they'll short feed Lowe, through which the melt I moved under pressure, there it no appreciable change in the viscosity of the en from the precrystalli~er to the formation of the droplet. A cantata flow rate it as-urea by the acted pump, ~ndep~dently of the gravity effect. Altogether, the retention time of sh~pr~crystallized ~2lt in the feed lone to the dropping it relatively short a a result of these measures, 80 that no cry6talllza-lion of the melt take place on the process, that could feat deputy and clog-gong end could interfere with the uniform form ton of droplet.
The entire system of the precry6tallizer l, feed line 11 through the droplet former may be closed off in a completely airtight manner so that melts on which a flow of oxygen during the precry6talli~ation process would hove detrlmen~ fleet with respect to Sally Jay be proceed. In other words, the droplet former 2 is connected with the pre-crystallizer by a sealed feed line which, in the embodiment shown, includes the supply line 11, the pump 12, the valve 13 and the hose-like section ha.
The lnstallatlnn Jay be shut down by ennui of the clown valve 13 arranged it the feed line 11 end the melt still on the precry~t~llizer may ye pumped into a reservoir B.
As eye in Ply. 2, the droplet wormer 2 consists in a manner known in itself of an outer tube pa and an inner tube 2b. In the inner tube a coccal arranged row of passage orifices 2c it arranged, which are signed cyclically it the orifice Ed distributed over the circumference of the outer tube pa upon the rotation of the latter, which it driven by a rotor, not shown. In .
this manner, the precry6tallized melt it fed in droplets from top precrystal-leer 1, ~ndlcated only in Fig. l, onto the cooling conveyor. With the and of vibrator 16 the toll plowable, freshly formed droplet are acted upon, By that the peaks formed during the dropping are collapsing and product bluets 14 i - 8 - ~z3~26~
of a very beautiful granule shape. It is possible thereby to effect the format lion of droplets at a low temperature whereby the products are preserved and less energy is required in view of the shorter cooling time an the cooling conveyor 3. The proportion of dust in the product is also reduced. As the product is already recrystallized when dropped onto the cooling conveyor 3, it is sufficient to provide cooling by means of the refrigerating device 157 on the cooling conveyor 3 at a constant cooling temperature. Zone cooling, as required in the known installations, is not necessary with the apparatus of the invention.
As the crystal content during the dropping process is of decisive importance for the particle formation and for the execution of this type ox granulate production, a measuring instrument 30 is provided, which determines this crystal content, for example by means of density measurements, In the example of embodiment this measuring instrument is placed in the line 7b.
By means of the measuring instrument 30 the regulation of the temperature of the cooling medium circulation is effected in a manner not shown in detail.
It is further possible to control the volume of the cooling medium by acting on the valve 20 and to affect the temperature in the precrystallizer in this manner.
Alternatively, it is possible to detect the height h of the solidified droplet 14 at the end of the cooling conveyor 3, in place of the measuring instrument I as this also represents an indication of the crystal content of the droplets coming from the droplet former 2. The higher the crystal con-tent, the higher the granule droplets and vice versa. The height of the so-lidified droplets may be detected optically or by means of a mechanical scanner.
The temperature of the cooling circulation is regulated by these scanners.
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Claims (24)
1. In an apparatus for the production of granules from two-phase mixtures, wherein the initial product is enriched with crystal nuclei in a temperature controlled pre-crystallizer and the pre-crystallized mass fully crystallized subsequently on a cooling conveyor, wherein a droplet former follows the pre-crystallizer in line, said droplet former consisting of two tubular bodies placed against each other with their walls, of which the outer body is provided with a plurality of passage orifices distributed over its circumference for the melt and the inner only with a coaxial row of passage orifice and that the said droplet former is arranged above the cooling conveyor so that the coaxial row of passage orifices is facing the said conveyor, with the orifices being cyclingly aligned with the orifices during the rotation of the outer tubular body, an improvement, including said droplet former being connected by means of a sealed feed line with the pre-crystallizer, said sealed feed line having approximately the same inner diameter as the inner tubular body of the droplet former.
2. Apparatus according to claim 1, wherein a device is provided for a forced transport of the pre-crystallized melt to the droplet former.
3. Apparatus according to claim 1, wherein the pre-crystallizer is equipped with a bypass and with a pump located therein and that the feed line to the droplet former is branching off the bypass circuit.
4. Apparatus according to claim 1, wherein the droplet former is connected with the feed line through a shutoff valve.
5. Apparatus according to claim 2, wherein the device for forced transport is a metering pump.
6. Apparatus according to claim 5, wherein the metering pump is a gear pump.
7. Apparatus according to claim 1, wherein a vibrator is arranged in the area of the droplet former under the cooling conveyor to act on the conveyor.
8. Apparatus according to claim 1, characterized in that the feed line opens axially into the inner tubular body.
9. Apparatus according to claim 1, wherein the pre-crystallizer is equipped with a bypass and with a pump located therein and that the feed line to the droplet former is branching off the bypass circuit, said apparatus further comprising one of the following features:
(a) a device is provided for a forced transport of the pre-crystallized melt to the droplet former;
(b) the feed line opens axially into the inner tubular body.
(a) a device is provided for a forced transport of the pre-crystallized melt to the droplet former;
(b) the feed line opens axially into the inner tubular body.
10. Apparatus according to claim 1, wherein the droplet former is connected with the feed line through a shutoff valve, said apparatus further comprising one of the following features:
(a) a device is provided for a forced transport of the pre-crystallized melt to the droplet former;
(b) the feed line opens axially into the inner tubular body; and (c) the pre-crystallizer is equipped with a bypass and with a pump located therein and that the feed line to the droplet former is branching off the bypass circuit.
(a) a device is provided for a forced transport of the pre-crystallized melt to the droplet former;
(b) the feed line opens axially into the inner tubular body; and (c) the pre-crystallizer is equipped with a bypass and with a pump located therein and that the feed line to the droplet former is branching off the bypass circuit.
11. Apparatus according to claim 1, wherein a metering pump is provided for the forced transportation from the pre-crystallizer to the droplet former, said apparatus further comprising one of the following features:
(a) the feed line opens axially into the inner tubular body;
(b) the pre-crystallizer is equipped with a bypass and with a pump located therein and that the feed line to the droplet former is branching off the bypass circuit; and (c) the droplet former is connected with the feed line through a shutoff valve.
(a) the feed line opens axially into the inner tubular body;
(b) the pre-crystallizer is equipped with a bypass and with a pump located therein and that the feed line to the droplet former is branching off the bypass circuit; and (c) the droplet former is connected with the feed line through a shutoff valve.
12. Apparatus according to claim 11, wherein a gear pump is provided as the metering pump.
13. Apparatus according to claim 1, wherein a vibrator is arranged in the area of the droplet former under the cooling conveyor to act on the conveyor, said apparatus further comprising at least one of the following features:
(a) the feed line opens axially into the inner tubular body;
(b) the pre-crystallizer is equipped with a by-pass and with a pump located therein and that the feed line to the droplet former is branching off the bypass circuit;
(c) the droplet former is connected with the feed line through a shutoff valve;
(d) the device for forced transportation from the pre-crystallizer to the droplet former is a metering pump;
(e) the metering pump is a gear pump.
(a) the feed line opens axially into the inner tubular body;
(b) the pre-crystallizer is equipped with a by-pass and with a pump located therein and that the feed line to the droplet former is branching off the bypass circuit;
(c) the droplet former is connected with the feed line through a shutoff valve;
(d) the device for forced transportation from the pre-crystallizer to the droplet former is a metering pump;
(e) the metering pump is a gear pump.
14. An apparatus for producing granules from two-phase mixtures comprising a temperature controlled pre-crystallizer means for cooling an initial substance enriched with crystal nuclei and wherein the resultant pre-crystallized melt is fully crystallized on a cooling surface, said apparatus further comprising a droplet former disposed over said cooling surface and including inner and outer telescoping tubes, said tubes having mutually facing surfaces which interengage, said inner tube communicating downstream with said pre-crystallizer by means of a sealed conduit whose inner diameter is approximately the same as that of the inner tube, said inner tube having a plurality of outlet orifices for conducting the pre-crystallized melt outwardly therethrough, said outer and inner tubes being arranged for relative rotation, said outer tube having a plurality of discharge orifices which are intermittently alignable with said outlet apertures in response to relative rotation between said tubes for discharging drops of pre-crystallized mass onto said cooling surface, and means for effecting relative rotation between said inner and outer tubes.
15. Apparatus according to claim 14 including means for effecting a forced flow of pre-crystallized melt to said droplet former.
16. Apparatus according to claim 14, wherein said pre-crystallizer includes a bypass circuit and a pump located therein, a conduit interconnects said bypass circuit with said droplet former.
17. Apparatus according to claim 14 including a conduit communicating said pre-crystallizer with said droplet former, and a shut-off valve disposed in said conduit.
18. Apparatus according to claim 14 including a metering pump for forcing pre-crystallized melt from said pre-crystallizer to said droplet former.
metering pump for forcing pre-crystallized melt from said pre-crystallizer to said droplet former.
metering pump for forcing pre-crystallized melt from said pre-crystallizer to said droplet former.
19. Apparatus according to claim 14, wherein said metering pump comprises a gear pump.
20. Apparatus according to claim 14,including a vibrator arranged to vibrate said cooling surface in the vicinity where droplets fall from said droplet former.
21. Apparatus according to claim 14, wherein said outer tube is rotated relative to said inner tube.
22. Apparatus according to claim 14, wherein said outlet orifices are aligned longitudinally along said inner tube.
23. Apparatus according to claim 14, wherein said cooling surface comprises a conveyor belt.
24. An apparatus for producing granules from two-phase mixtures comprising a temperature controlled pre-crystallizer means for cooling an initial substance enriched with crystal nuclei, and wherein the resultant pre-crystallized melt is fully crystallized on a cooling surface, said apparatus further comprising a droplet former disposed over said cooling surface and including inner and outer telescoping tubes, said tubes having mutually facing surfaces which interengage, said inner tube communicating with said pre-crystallizer and having a plurality of outlet orifices for conducting the pre-crystallized melt outwardly therethrough, said outer and inner tubes being arranged for relative rotation, said outer tube having a plurality of discharge orifices which are intermittently alignable with said outlet orifices in response to relative rotation between said tubes for discharging drops of pre-crystallized mass onto said cooling surface, and means for effecting relative rotation between said inner and outer tubes, said droplet former being connected to said pre-crystallizer by means of a sealed conduit, said sealed conduit having substantially the same diameter as the inner tube of said droplet former, and means for effecting a forced flow of recrystallized melt to said droplet former.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000439275A CA1238265A (en) | 1983-10-19 | 1983-10-19 | Apparatus for the production of granules from two- phase mixtures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000439275A CA1238265A (en) | 1983-10-19 | 1983-10-19 | Apparatus for the production of granules from two- phase mixtures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1238265A true CA1238265A (en) | 1988-06-21 |
Family
ID=4126317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000439275A Expired CA1238265A (en) | 1983-10-19 | 1983-10-19 | Apparatus for the production of granules from two- phase mixtures |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1238265A (en) |
-
1983
- 1983-10-19 CA CA000439275A patent/CA1238265A/en not_active Expired
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